Dear Aspirants,

This Spotlight is a part of our Mission Nikaalo Prelims-2023.

You can check the broad timetable of Nikaalo Prelims here

Session Details

YouTube LIVE with Parth sir – 7 PM  – Prelims Spotlight Session

Evening 04 PM  – Daily Mini Tests

Join our Official telegram channel for Study material and Daily Sessions Here

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12th Apr 2023

Soils of India

Drainage

The flow of water through well-defined channels is known as ‘drainage’ and the network of such channels is called a ‘drainage system’.

Discordant drainage

A pattern of drainage that bears no relation to the structure of the underlying rock. This may be because:

1. The drainage pattern developed on rock strata that have since been removed by erosion; a process known as superimposition. The drainage pattern thus developed is called superimposed drainage (or Epigenetic or Superinduced Drainage). Examples: The Damodar, the Subarnarekha, the Chambal, the Banas and the rivers flowing at the Rewa Plateau, rivers of eastern USA and southern France.

2. The drainage pattern was already present before a period of uplift and folding that formed the present structure. As the uplift took place, the rivers were able to cut down at approximately the same rate and so maintain their courses. This process is called antecedence and the drainage system thus developed is called antecedent drainage.

Many of the Himalayan rivers have antecedent origin i.e. these rivers existed even before the Himalayan ranges were uplifted. These rivers originate in the Tibetan side beyond the mountain ranges of Himalayas. The Indus, Satluj, Alaknanda, Gandak, Kosi, Brahmaputra all have an antecedent origin. Since these rivers are antecedent, they run transverse to the mountain ranges cutting deep V-shaped, steep-sided valleys (deep gorges).

Concordant Drainage (also called accordant drainage)

The pattern of drainage which arises from and closely follows the trends of the underlying strata is called concordant drainage.

1. Consequent Streams: Those streams whose courses are the direct consequence of the initial topography are called consequent streams.
2. Subsequent Streams: These are developed after the master consequent.
3. Obsequent streams: These flow in opposite direction to the master consequent.
4. Resequent Streams: A resequent stream flows in the same direction as that of the initial consequent stream, but which develops in response to a new base level formed due to inversion of relief.

Drainage pattern:

Drainage pattern refers to a design which a river and its tributaries form together from its source to its mouth. The drainage pattern of an area is the outcome of:

• The geological time period,
• Nature and structure of rocks,
• Topography,
• Slope,
• Amount of water flowing, and
• The periodicity of the flow.

Some Important Drainage Patterns:

A combination of several patterns may be found in the same drainage basin.

1. Dendritic: The dendritic pattern develops where the river channel follows the slope of the terrain. The drainage pattern resembling the branches of a tree is known as “dendritic” the examples of which are the rivers of northern plain. It is the most common stream pattern. A dendritic pattern develops in a terrain which has uniform lithology, and where faulting and jointing are insignificant.

2. Radial: The radial pattern develops when streams flow in different directions from a central peak or a dome-like structure. E.g. the rivers like the Narmada, Son and Mahanadi originating from Maikal Hills flow in different directions and are good examples of a radial pattern.

Radial drainage patterns are also found/in the Girnar Hills (Kathiwar, Gujarat), and Mikir Hills of Assam.

3. Trellis: When the primary tributaries of rivers flow parallel to each other and secondary tributaries join them at right angles, the pattern is known as ‘trellis’. A trellis drainage pattern develops where hard and soft rocks lie parallel to each other. For example, rivers in the upper part of the Himalayan region and in the old folded mountains of the Singhbhum (Chotanagpur Plateau) have drainage of trellis pattern. The trellis drainage pattern can also be seen in the Appalachian region of the U.S.A., where hard and soft rocks occur in parallel bands.

4. Centripetal: When the rivers discharge their waters from all directions in a lake or depression, the pattern is known as ‘centripetal’. This drainage pattern is also called endorheic drainage. For example, Loktak lake in Manipur.

5. Rectangular: In this drainage, both the main stream and its tributaries show right-angled bends. A rectangular drainage pattern develops on a strongly jointed rocky terrain. It differs from trellis pattern drainage, since it is more irregular and its tributary streams are not as long or as parallel as in trellis drainage. Example: Colorado river (USA), streams found is the Vindhyan Mountains of India.

6. Barbed: If you look at the way that tributaries empty into larger rivers, you will notice that most of them flow in the same direction as the rivers they empty into. But quite a large number flow the other way. In fact, you will find stretches of some rivers where every tributary empties into the river in the “wrong” direction! Such an occurrence is known as a barbed drainage pattern.

Most barbed drainage patterns are the result of river-capture which reverses the direction of flow. However, the tributary channels continue to flow in their original direction.

The Arun River (Nepal), a tributary of the Kosi is an interesting example of barbed drainage pattern.

7. Annular: Annular pattern represents that part of a drainage pattern in which the subsequent streams follow the curving or arcuate courses before joining the conse­quent stream. These results from a partial adaptation to an underground circular structure i.e. batholiths. This is not a very common drainage pattern in India. Some examples of this are however found in Pithoragarh (Uttarakhand), Nilgiri Hills in Tamil Nadu and Kerala.

8. Parallel drainage: The drainage pattern in which the rivers flow almost parallel to each other is known as parallel drainage. The small and swift rivers originating in the Western Ghats and discharging their water into the Arabian Sea provide a good example of parallel drainage pattern in India.

9. Deranged pattern: This is an uncoordinated pattern of drainage characteristic of a region recently vacated by an ice-sheet. The picture is one of numerous water courses, lakes and marshes; some inter-connected and some in local drainage basins of their own. This type of drainage is found in the glaciated valleys of Karakoram.

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Dear Aspirants,

This Spotlight is a part of our Mission Nikaalo Prelims-2023.

You can check the broad timetable of Nikaalo Prelims here

Session Details

YouTube LIVE with Parth sir – 7 PM  – Prelims Spotlight Session

Evening 04 PM  – Daily Mini Tests

Join our Official telegram channel for Study material and Daily Sessions Here

---

11th Apr 2023

Let’s begin with the first physiographic division. It consists of:

• THE HIMALAYAS, and
• The Northeastern hills (Purvanchal).

A) The Himalayas:

The Himalayas are the highest and longest of all young fold mountains of the world. The Pamir, known as the roof of the world, connects the Himalayas with the high ranges of Central Asia.

Let’s begin by understanding how the Himalayas came into being:

About 40 to 50 million years ago, two large landmasses, India and Eurasia, driven by plate movement, collided. As a result, the sediments accumulated in Tethys Sea (brought by rivers) were compressed, squeezed and series of folds were formed, one behind the other, giving birth to folded mountains of the Himalayas.

Recent studies show that India is still moving northwards at the rate of 5cm/year and crashing into the rest of Asia, thereby constantly increasing the height of Himalayas.

The North-South division of the Himalayas

The Himalayas consist of a series of parallel mountain ranges:

1. The Greater Himalayan range, which includes:
   • The Great Himalayas(Himadri), and
   • The Trans-Himalayan range
2. The Lesser Himalayas (or Himachal), and
3. The Outer Himalayas (or Shiwalik).

• Formation of these ranges: The Himadri and Himachal ranges of the Himalayas have been formed much before the formation of Siwalik range. The rivers rising in the Himadri and Himachal ranges brought gravel, sand and mud along with them, which was deposited in the rapidly shrinking Tethys Sea. In the course of time, the earth movements caused the folding of these relatively fresh deposits of sediments, giving rise to the least consolidated Shiwalik range.
• Characteristic Features:
  • Notice in the map shown above that the Himalayas form an arcuate curve which is convex to the south. This curved shape of the Himalayas is attributed to the maximum push offered at the two ends on the Indian peninsula during its northward drift. In the north-west, it was done by Aravalis and in the Northeast by the Assam ranges.
  • Syntaxis/ Syntaxial bends: The gently arching ranges of the Himalayan mountains on their Western and Eastern extremities are sharply bent southward in deep Knee-bend flexures that are called syntaxial bends. On both the ends, the great mountains appear to bend around a pivotal point. The western point is situated south of the Pamir where the Karakoram meets the Hindu Kush. A similar sharp, almost hairpin bend occurs on the eastern limit of Arunachal Pradesh where the strike of the mountain changes sharply from the Easterly to Southerly trend. Besides these two major bends, there are a number of minor syntaxial bends in other parts of Himalayas.
    Syntaxial Bends of Himalayas
  • The Himalayas are wider in the west than in the east. The width varies from 400 km in Kashmir to 150 km in Arunachal Pradesh. The main reason behind this difference is that the compressive force was more in the east than in the west. That is why high mountain peaks like Mount Everest and Kanchenjunga are present in the Eastern Himalayas.
  • The ranges are separated by deep valleys creating a highly dissected topography.
  • The southern slopes of the Himalayas facing India are steeper and those facing the Tibetan side are generally gentler.
• Let’s take up these Himalayan mountain ranges one by one:   The Himalayan Ranges | the Greater Himalayan Range, the Lesser Himalayas, the Shivaliks Indus-Tsangpo Suture Zone: It represents a belt of tectonic compression caused by the underthrusting of the Indian shield/ plate against the Tibetan mass. It marks the boundary between the Indian and Eurasian plates. The suture zone stretches from the North-Western Himalayan syntaxis bordering the Nanga Parbat to the East as far as the Namche Barwa Mountain. The Karakoram Range and the Ladakh plateau lie to the north of ITSZ and originally formed a part of the European plate. Main Central Thrust Zone: This separates the Higher Himalayas in the north from lesser Himalayas in the south. It has played an important role in the tectonic history of these mountains. Main Boundary Thrust: It is a reverse fault of great dimensions which extends all the way from Assam to Punjab and serves to separate the outer Himalayas from the lesser Himalayas.Himalayan Frontal Fault: It is a series of reverse faults that demarcates the boundary of the Shivalik from of the Himalayan province from the alluvial expanse of the Indo-Gangetic plains.

Besides the longitudinal divisions, the Himalayas have been divided on the basis of regions from west to east:

These divisions have been demarcated by river valleys:

1. Punjab Himalayas:
   • A large portion of Punjab Himalayas is in Jammu and Kashmir and Himachal Pradesh. Hence they are also called the Kashmir and Himachal Himalaya.
   • Major ranges: Karakoram, Ladakh, Pir Panjal, Zaskar and Dhaola Dhar.
   • The general elevation falls westwards.
   • The Kashmir Himalayas are also famous for Karewa formations.
     • ‘Karewas’ in Kashmiri language refer to the lake deposits, found in the flat-topped terraces of the Kashmir valley and on the flanks of the Pir Panjal range.
     • These deposits consist of clays, silts and sands, these deposits also show evidence of glaciation.
     • The occurrence of tilted beds of Karewas at the altitudes of 1500-1800m on the flanks of the Pir Panjal strongly suggests that the Himalayas were in process of uplift as late as Pliocene and Pleistocene (1.8mya to 10kyears ago)
     • Karewas are famous for the cultivation of Zafran, a local variety of saffron.
2. Kumaon Himalayas
3. Nepal Himalayas:
   • Tallest section of Himalayas
4. Sikkim Himalayas:
   • Teesta river originates near Kanchenjunga
   • Jelep la pass- tri-junction of India- China-Bhutan
5. Assam Himalayas:
   • The Himalayas are narrower in this region and Lesser Himalayas lie close to Great Himalayas.
   • Peaks: Namcha Barwa, Kula Kangri
   • Bengal ‘Duars’
   • Diphu pass- tri-junction of India- China-Myanmar
   • The Assam Himalayas show a marked dominance of fluvial erosion due to heavy rainfall.

Glaciers and Snowline:

Snowline: The lower limit of perpetual snow is called the ‘snowline’. The snowline in the Himalayas has different heights in different parts, depending on latitude, altitude, amount of precipitation, moisture, slope and local topography.

1. The snowline in the Western Himalaya is at a lower altitude than in the Eastern Himalaya. E.g. while the glaciers of the Kanchenjunga in the Sikkim portion hardly move below 4000m, and those of Kumaon and Lahul to 3600m, the glaciers of the Kashmir Himalayas may descend to 2500m above the sea level.

• It is because of the increase in latitude from 28°N in Kanchenjunga to 36°N in the Karakoram (Lower latitude —> warmer temperatures —> higher snowline).
• Also, the Eastern Himalayas rise abruptly from the planes without the intervention of High ranges.
• Though the total precipitation is much less in the western Himalayas, it all takes place in the form of snow.

2. In the Great Himalayan ranges, the snowline is at a lower elevation on the southern slopes than on the northern slopes. This is because the southern slopes are steeper and receive more precipitation as compared to the northern slopes.

Glaciers: The main glaciers are found in the Great Himalayas and the Trans-Himalayan ranges (Karakoram, Ladakh and Zaskar). The Lesser Himalayas have small glaciers, though traces of large glaciers are found in the Pir Panjal and Dhauladhar ranges. Some of the important glaciers are:

Key differences between the Eastern and Western Himalayas:

Important Passes in India:

A pass is a narrow gap in a mountain range which provides a passageway through the barrier.

1. Pir Panjal Pass – It provides the shortest and the easiest metal road between Jammu and the Kashmir Valley. But this route had to be closed down as a result of partition of the subcontinent.
2. Banihal Pass – It is in Jammu and Kashmir. The road from Jammu to Srinagar transversed Banihal Pass until 1956 when Jawahar Tunnel was constructed under the pass. The road now passes through the tunnel and the Banihal Pass is no longer used for road transport.
3. Zoji La (Pass) – It is in the Zaskar range of Jammu and Kashmir. The land route from Srinagar to Leh goes through this pass.
4. Shipki La (Pass) – It is in Himachal Pradesh. The road from Shimla to Tibet goes through this pass. The Satluj river flows through this pass.
5. Bara Lacha Pass – It is also in Himachal Pradesh. It links Mandi and Leh by road.
6. Rohtang Pass – It is also in Himachal Pradesh. It cuts through the Pir Panjal range. It links Manali and Leh by road.
7. Niti Pass – It is in Uttarakhand. The road to the Kailash and the Manasarovar passes through it.
8. Nathu La (Pass) – It is in Sikkim. It gives way to Tibet from Darjeeling and Chumbi valley. The Chumbi river flows through this pass.
9. Jalep La (Pass) – At the tri-junction of India- China-Bhutan. The Teesta river has created this pass.

B) The North-Eastern Hills and Mountains

The Brahmaputra marks the eastern border of Himalayas. Beyond the Dihang gorge, the Himalayas bend sharply towards the south and form the Eastern hills or Purvanchal.

• These hills run through the northeastern states of India.
• These hills differ in scale and relief but stem from the Himalayan orogeny.
• They are mostly composed of sandstones (i.e. Sedimentary rocks).
• These hills are covered with dense forests.
• Their elevation decreases from north to south. Although comparatively low, these hill ranges are rather forbidding because of the rough terrain, dense forests and swift streams.
• Purvanchal hills are convex to the west.
• These hills are composed of:
  • Patkai Bum – Border between Arunachal Pradesh and Myanmar
  • Naga Hills
  • Manipuri Hills – Border between Manipur and Myanmar
  • Mizo Hills.
• Patkai Bum and Naga Hills form the watershed between India and Myanmar.
• Extension of Purvanchal continues in Myanmar as Arakan Yoma –then Andaman and Nicobar Islands.

The importance of Himalayan Region:

1. Climatic Influence – The altitude of the Himalayas, their sprawl and extension intercept the summer monsoon. They also prevent the cold Siberian air masses from entering into India.

2. Defence
3. Source of perennial rivers
4. Source of fertile soils
5. Generation of hydroelectricity
6. Forest wealth
7. Orchards
8. Minerals – The Himalayan region is rich in minerals e.g. gold, silver, copper, lead etc. are known to occur. Coal is found in Kashmir. But at the present level of technological advancement, it is not possible to extract these minerals. Also, it is not economically viable.
9. Tourism
10. Pilgrimage

NORTHERN PLAINS

Location and Extent:

Northern plains are the youngest physiographic feature in India. They lie to the south of the Shivaliks, separated by the Himalayan Frontal Fault (HFF). The southern boundary is a wavy irregular line along the northern edge of the Peninsular India. On the eastern side, the plains are bordered by the Purvanchal hills.

Formation of Northern Plains:

Due to the uplift of the Himalayas in the Tethys Sea, the northern part of the Indian Peninsula got subsided and formed a large basin.

That basin was filled with sediments from the rivers which came from the mountains in the north and from the peninsula in the south. These extensive alluvial deposits led to the formation of the northern plains of India.

Chief Characteristics:

• The northern plain of India is formed by three river systems, i.e. the Indus, the Ganga and the Brahmaputra; along with their tributaries.
• The northern plains are the largest alluvial tract of the world. These plains extend approximately 3200 km from west to east.
• The average width of these plains varies between 150 and 300 km. In general, the width of the northern plains increases from east to west (90-100km in Assam to about 500km in Punjab).
• The exact depth of alluvium has not yet been fully determined. According to recent estimates, the average depth of alluvium in the southern side of the plain varies between 1300-1400m, while towards the Shiwaliks, the depth of alluvium increases. The maximum depth of over 8000m has been reached in parts of Haryana.
• The extreme horizontality of this monotonous plain is its chief characteristic (200m – 291m). The highest elevation of 291 m above mean sea level near Ambala forms a watershed between the Indus system and Ganga system).
• The monotony of the physical landscape is broken at the micro-level by the river bluffs, levees etc.
  • [Floodplain – That part of a river valley, adjacent to the channel, over which a river flows in times of a flood.
  • Levee – An elevated bank flanking the channel of the river and standing above the level of the flood plain.
  • Bluff – A river cut cliff or steep slope on the outside of a meander. A line of bluffs often marks the edge of a former floodplain.]

Physiographic Divisions of the Northern Plains:

From the north to the south, the northern plains can be divided into three major zones:

1. The Bhabar
2. The Tarai
3. The alluvial plains.

The alluvial plains can be further divided into the Khadar and the Bhangar as illustrated below:

Let’s understand these divisions one by one:

Bhabar:

• Bhabar is a narrow belt (8-10km wide) which runs in the west-east direction along the foot of the Himalayas from the river Indus to Teesta.
  Source
• Rivers which descend from the Himalayas deposit their load along the foothills in the form of alluvial fans.
• These fans consisting of coarser sediments have merged together to build up the piedmont plain/the Bhabar.

• The porosity of the pebble-studded rock beds is very high and as a result, most of the streams sink and flow underground. Therefore, the area is characterized by dry river courses except in the rainy season.
• The Bhabar track is not suitable for cultivation of crops. Only big trees with large roots thrive in this region.
• The Bhabar belt is comparatively narrow in the east and extensive in the western and north-western hilly region.

Tarai:

• It is a 10-20 km wide marshy region in the south of Bhabar and runs parallel to it.
• The Tarai is wider in the eastern parts of the Great Plains, especially in the Brahmaputra valley due to heavy rainfall.
• It is characterized by the re-emergence of the underground streams of the Bhabar belt.
• The reemerged water transforms large areas along the rivers into badly drained marshy lands.
• Once covered with dense forests, most of the Tarai land (especially in Punjab, Uttar Pradesh and Uttarakhand) has been reclaimed and turned into agricultural land over a period of time.

Bhangar:

• It is the older alluvium along the river beds forming terraces higher than the flood plain.
• Dark in colour, rich in humus content and productive.
• The soil is clayey in composition and has lime modules (called kankar)
• Found in doabs (inter-fluve areas)
• ‘The Barind plains’ in the deltaic region of Bengal and the ‘bhur formations’ in the middle Ganga and Yamuna doab are regional variations of Bhangar. [Bhur denotes an elevated piece of land situated along the banks of the Ganga river especially in the upper Ganga-Yamuna Doab. This has been formed due to accumulation of wind-blown sands during the hot dry months of the year]
• In relatively drier areas, the Bhangar also exhibits small tracts of saline and alkaline efflorescence known as ‘Reh’, ‘Kallar’ or ‘Bhur’. Reh areas have spread in recent times with an increase in irrigation (capillary action brings salts to the surface).
• May have fossil remains of even those plants and animals which have become extinct.

Khadar:

• Composed of newer alluvium and forms the flood plains along the river banks.
• Light in colour, sandy in texture and more porous.
• Found near the riverbeds.
• A new layer of alluvium is deposited by river flood almost every year. This makes them the most fertile soils of Ganges.
• In Punjab, the Khadar rich flood plains are locally known as ‘Betlands’ or ‘Bets’.
• The rivers in Punjab-Haryana plains have broad flood plains of Khadar flanked by bluffs, locally known as Dhayas. These bluffs are as high as 3metres.

Northern Plain: Regional Divisions

The Regional Divisions of the Northern Plains: Punjab, Ganga and the Brahmaputra Plains.

1. Punjab Plains:

• The Punjab plains form the western part of the northern plain.
• In the east, the Delhi-Aravalli ridge separates it from the Ganga plains.
• This is formed by the Indus and its tributaries; like Jhelum, Chenab, Ravi, Beas and Sutlej. A major portion of these plains is in Pakistan.
• It is divided into many Doabs (do-“two” + ab- “water or river” = “a region or land lying between and reaching to the meeting of the two rivers”).
    Khadar and Bhangar
• Important features:
  • Khadar rich flood plains known as ‘Betlands’ or ‘Bets’.
  • The rivers in Punjab-Haryana plains have broad flood plains of Khadar flanked by bluffs, locally known as Dhayas.
  • The northern part of this plane adjoining the Shivalik hills has been heavily eroded by numerous streams, which are called Chhos.
  • The southwestern parts, especially the Hisar district is sandy and characterized by shifting sand-dunes.

2. Ganga Plains:

• The Ganga plains lie between the Yamuna catchment in the west to the Bangladesh border in the East.
• The lower Ganga plain has been formed by the down warping of a part of Peninsular India between Rajmahal hills and the Meghalaya plateau and subsequent sedimentation by the Ganga and Brahmaputra rivers.
• The main topographical variations in these plains include Bhabar, Tarai, Bhangar, Khadar, levees, abandoned courses etc.
• Almost all the rivers keep on shifting their courses making this area prone to frequent floods. The Kosi river is very notorious in this respect. It has long been called the ‘Sorrow of Bihar’.
• The northern states, Haryana, Delhi, UP, Bihar, part of Jharkhand and West Bengal in the east lie in the Ganga plains.
• The Ganga-Brahmaputra delta: the largest delta in the world. A large part of the coastal delta is covered tidal forests called Sunderbans. Sunderbans, the largest mangrove swamp in the world gets its name from the Sundari tree which grows well in marshland. It is home to the Royal Tiger and crocodiles.

3. Brahmaputra Plains:

• This plain forms the eastern part of the northern plain and lies in Assam.
• Its western boundary is formed by the Indo-Bangladesh border as well as the boundary of the lower Ganga Plain. Its eastern boundary is formed by Purvanchal hills.
• The region is surrounded by high mountains on all sides, except on the west.
• The whole length of the plain is traversed by the Brahmaputra.

• The Brahmaputra plains are known for their riverine islands (due to the low gradient of the region) and sand bars.
• The innumerable tributaries of the Brahmaputra river coming from the north form a number of alluvial fans. Consequently, the tributaries branch out in many channels giving birth to river meandering leading to the formation of bill and ox-bow lakes.
• There are large marshy tracts in this area. The alluvial fans formed by the coarse alluvial debris have led to the formation of terai or semi-terai conditions.

Significance of this region:

• The plains constitute less than one-third of the total area of the country but support over 40 percent of the total population of the country.
• Fertile alluvial soils, flat surface, slow-moving perennial rivers and favourable climate facilitate an intense agricultural activity.
• The extensive use of irrigation has made Punjab, Haryana and western part of Uttar Pradesh the granary of India (Prairies are called the granaries of the world).
• Cultural tourism: Several sacred places and centres of pilgrimage are situated in these plains e.g. Haridwar, Amritsar, Varanasi, Allahabad, Bodh Gaya etc.
• The sedimentary rocks of plains have petroleum and natural gas deposits.
• The rivers here have very gentle gradients which make them navigable over long distances.

PENINSULAR PLATEAU

A. Location and Extent

• The Peninsular Plateau lies to the south of the Northern Plains of India.
• It is bordered on all sides by the hill ranges:
• Delhi ridge in the north-west (extension of Aravalis),
• the Rajmahal Hills in the east,
• Gir range in the west, and
• the Cardamom Hills in the south constitute the outer extent of the peninsular plateau.

• Outlier:
  • Shillong and Karbi-Anglong plateau.

Note: Kutchch Kathiawar region – The region, though an extension of Peninsular plateau (because Kathiawar is made of the Deccan Lava and there are tertiary rocks in the Kutch area), they are now treated as an integral part of the Western Coastal Plains as they are now levelled down.

• The Garo-Rajmahal Gap:
  • The two disconnected outlying segments of the plateau region are seen in the Rajmahal and Garo-Khasi Jaintia hills.
  • It is believed that due to the force exerted by the northeastward movement of the Indian plate at the time of the Himalayan origin, a huge fault was created between the Rajmahal hills and the Meghalaya plateau
  • Later, this depression got filled up by the deposition activity of the numerous rivers.
  • As a result, today the Meghalaya and Karbi Anglong plateau stand detached from the main Peninsular Block.

Geological History and Features:

The peninsular plateau is a tableland which contains igneous and metamorphic rocks. It is one of the oldest and the most stable landmass of India.

In its otherwise stable history, the peninsula has seen a few changes like:

1. Gondwana Coal Formation.
2. Narmada-Tapi rift valley formation.
3. Basalt Lava eruption on Deccan plateau:

During its journey northward after breaking off from the rest of Gondwana, the Indian Plate passed over a geologic hotspot, the Réunion hotspot, which caused extensive melting underneath the Indian Craton. The melting broke through the surface of the craton in a massive flood basalt event, creating what is known as the Deccan Traps (Its various features have been discussed in the later portion of the article).

Chief Characteristics:

The entire peninsular plateau region is an aggregation of several smaller plateaus and hill ranges interspersed with river basins and valleys. The Chhattisgarh plain occupied by the dense Dandakaranya forests is the only plain in the peninsula.

1. General elevation and flow of rivers:

• The average elevation is 600-900 metres.
• The general elevation of the plateau is from the west to the east, which is also proved by the pattern of the flow of rivers.
• Barring Narmada and Tapti all the major rivers lying to the south of the Vindhyas flow eastwards to fall into the Bay of Bengal.
• The westward flow of Narmada and Tapi is assigned to the fact that they have been flowing through faults or rifts which were probably caused when the Himalayas began to emerge from the Tethys Sea of the olden times.

2. Some of the important physiographic features of this region are:

• Tors – Prominent, isolated mass of jointed, weathered rock, usually granite.

• Block Mountains and Rift Valleys:
• Spurs: A marked projection of land from a mountain or a ridge

• Bare rocky structures,
• Series of hummocky hills and wall-like quartzite dykes offering natural sites for water storage.
• Broad and shallow valleys and rounded hills
• Ravines and gorges: The northwestern part of the plateau has a complex relief of ravines and gorges. The ravines of Chambal, Bhind and Morena are some of the well-known examples.

3. The Deccan Traps:

• One of the most important features of the peninsular plateau is the black soil area in the western and northwestern part of the plateau, which is known as the Deccan Trap.
• From the end of the Cretacious until the beginning of the Eocene, numerous fissure-type eruptions took place in the north-western part of the Deccan plateau. It is believed that the lava outpourings were more than the mass comprising the present-day Himalayas.
• It covers a major portion of the Maharashtra plateau and parts of Gujarat, northern Karnataka and Malwa plateau. Some parts of Tamil Nadu, Andhra Pradesh, UP, and Jharkhand have some outliers of Deccan trap.
• Basalt is the main rock of the region.
• The region has black cotton soil as a result of weathering of this lava material and this soil is one of the finest examples of the parent material controlled soils.

Physiographic Divisions:

On the basis of prominent relief features, the peninsular plateau can be divided into three broad groups:

• The Central Highlands
• The Deccan Plateau
• The Northeastern Plateau.

Let’s take up these divisions one by one:

1. The Central Highlands

• The northern segment of the peninsular plateau is known as the Central Highlands.
• Location:
  1. North of Narmada river.
  2. They are bounded to the west by the Aravallis.
  3. Satpura ranges (formed by a series of scarped plateaus) lie in the South.
• General Elevation: 700-1,000 m above the mean sea level and it slopes towards the north and northeastern directions.
• These highlands consist of the:
  1. Marwar upland – to the east of Aravallis in Rajasthan
     • A rolling plain carved by Banas river. [Rolling Plain: ‘Rolling plains’ are not completely flat; there are slight rises and fall in the landform. Ex: Prairies of USA]
     • The average elevation is 250-500 m above sea level.
  2. Madhya Bharat Pathar – to the east of Marwar upland.
  3. Malwa plateau – It lies in Madhya Pradesh between Aravali and Vindhyas. It is composed of the extensive lava flow and is covered with black soils.
  4. Bundelkhand plateau – It lies along the borders of UP and MP. Because of intensive erosion, semi-arid climate and undulating area, it is unfit for cultivation.
  5. Baghelkhand plateau – It lies to the east of the Maikal range.
  6. Chhotanagpur plateau – the northeast part of Peninsular plateau.
     • It Includes Jharkhand, parts of Chhattisgarh and West Bengal.
     • This plateau consists of a series of step-like sub-plateaus (locally called peatlands – high-level plateau). It is thus famous as the Patland plateau and known as Ruhr of India.
     • Rajmahal Hills are the northeastern projection of Chhota Nagpur Plateau.
     • It is a mineral-rich plateau.

• The extension of the Peninsular plateau can be seen as far as Jaisalmer in the West, where it has been covered by the longitudinal sand ridges and crescent-shaped sand dunes called barchans.
• This region has undergone metamorphic processes in its geological history, which can be corroborated by the presence of metamorphic rocks such as marble, slate, gneiss, etc.
• Most of the tributaries of the river Yamuna have their origin in the Vindhyan and Kaimur ranges. Banas is the only significant tributary of the river Chambal that originates from the Aravalli in the west.

2. The Deccan Plateau

• The Deccan Plateau lies to the south of the Narmada River and is shaped as an inverted triangle.
• It is bordered by:
  1. The Western Ghats in the west,
  2. The Eastern Ghats in the east,
  3. The Satpura, Maikal range and Mahadeo hills in the north.
• It is volcanic in origin, made up of horizontal layers of solidified lava forming trap structure with step-like appearance. The sedimentary layers are also found in between the layers of solidified lava, making it inter–trapping in structure.
• Most of the rivers flow from west to east.
• The plateau is suitable for the cultivation of cotton; home to rich mineral resources and a source to generate hydroelectric power.
• The Deccan plateau can be subdivided as follows:
  1. The Maharashtra Plateau – it has typical Deccan trap topography underlain by basaltic rock, the regur.
  2. The Karnataka Plateau (also known as Mysore plateau) – divided into western hilly country region of ‘Malnad’ and plain ‘Maidan’
  3. Telangana Plateau

3. The Northeastern Plateau:

• The Meghalaya (or Shillong) plateau is separated from peninsular rock base by the Garo-Rajmahal gap.
• Shillong (1,961 m) is the highest point of the plateau.
• The region has the Garo, Khasi, Jaintia and Mikir (Rengma) hills.
• An extension of the Meghalaya plateau is also seen in the Karbi Anglong hills of Assam.
• The Meghalaya plateau is also rich in mineral resources like coal, iron ore, sillimanite, limestone and uranium.
• This area receives maximum rainfall from the south-west monsoon. As a result, the Meghalaya plateau has a highly eroded surface. Cherrapunji displays a bare rocky surface devoid of any permanent vegetation cover.

Hill ranges of the peninsula:

Most of the hills in the peninsular region are of the relict type (residual hills). They are the remnants of the hills and horsts formed many million years ago (horst: uplifted block; graben: subsided block).

The plateaus of the Peninsular region are separated from one another by these hill ranges and various river valleys.

1. The Aravalli Mountain Range:

• It is a relic of one of the oldest fold mountains of the world.
• Its general elevation is only 400-600 m, with few hills well above 1,000 m.
• At present, it is seen as a discontinuous ridge from Delhi to Ajmer and rising up to 1722m (Gurushikhar peak in Mount Abu) and thence southward.
• It is known as ‘Jarga’ near Udaipur and ‘Delhi Ridge’ near Delhi.
• Dilwara Jain Temple, the famous Jain temple is situated on Mt. Abu.

2. Vindhyan Ranges:

• They rise as an escarpment running parallel to the Narmada-Son valley.
• General elevation: 300 to 650 m.
• Most of them are made up of sedimentary rocks of ancient ages.
• They act as a watershed between Gangetic and peninsular river systems.

3. Satpura ranges:

• Satpura range is a series of seven mountains (‘Sat’ = seven and ‘pura’ = mountains).
• The seven mountain ranges or folds of Satpura’s are:
  • Maikal Hills
  • Mahadeo Hills near Pachmarhi
  • Kalibhit
  • Asirgarh
  • Bijagarh
  • Barwani
  • Arwani which extends to Rajpipla Hills in Eastern Gujarat.
• Satpura ranges run parallel between Narmada and Tapi, parallel to Maharashtra-MP border.
• Dhupgarh (1,350 m) near Pachmarhi on Mahadev Hills is the highest peak of the Satpura Range.
• Amarkantak (1,127 m) is another important peak. Amarkantak is the highest peak of the Maikal Hills from where two prominent rivers – the Narmada and the Son originate.
• Note that three rivers originate from the three sides of Maikal hills (as shown in the following map) but, from Amarkantak, only two rivers (the Narmada and the Son) originate (and not Mahanadi).

4. Western and Eastern Ghats:

• The Western Ghats:
  • These are a faulted part of the Deccan plateau running parallel from the Tapi valley to a little north of Kanyakumari (1600km). Their western slope is like an escarpment while eastern slope merges gently with the plateau.
  • Their average elevation is about 1,500 m with the height increasing from north to south.
• The Eastern Ghats are in the form of residual mountains which are not regular but broken at intervals.
• The Eastern and the Western Ghats meet each other at the Nilgiri hills.
• A brief comparison between them:

Note: The Western Ghats are continuous and can be crossed through passes only. There are four main passes which have developed in the Western Ghats. These are:

1. Thal Ghat – It links Nasik to Mumbai.
2. Bhor Ghat – It links Mumbai to Pune.
3. Pal Ghat – This pass is located between the Nilgiris and the Annamalai mountains. It is in Kerala and connects Kochi and Chennai.
4. Senkota Pass – This pass located between the Nagercoil and the Cardamom hills links Thiruvananthapuram and Madurai.

For the geographical location of these passes, see the following map:

Significance of the Peninsular Region:

• Rich in mineral resources: The peninsular region of India is rich in both metallic and non-metallic minerals. About 98% of the Gondwana coal deposits of India are found in the peninsular region.
• Agriculture: Black soil found in a substantial part of the peninsula is conducive for the cultivation of cotton, maize , citrus fruits etc. Some areas are also suitable for the cultivation of tea, coffee, groundnut etc.
• Forest Products: Apart from teal, sal wood and other forest products, the forests of Western and Eastern Ghats are rich in medicinal plants and are home to many wild animals.
• Hydel Power: many rivers, which have waterfalls. They help in the generation of hydroelectric power.
• Tourism: There are numerous hill stations and hill resorts like Ooty, Mahabaleshwar, Khandala, etc.

THE INDIAN DESERT

The Indian desert is also known as the Thar Desert or the Great Indian Desert.

Location and Extent:

• Location – To the north-west of the Aravali hills.
• It covers Western Rajasthan and extends to the adjacent parts of Pakistan.

Geological History and Features

• Most of the arid plain was under the sea from Permo-Carboniferous period and later it was uplifted during the Pleistocene age. This can be corroborated by the evidence available at wood fossils park at Aakal and marine deposits around Brahmsar, near Jaisalmer (The approximate age of the wood fossils is estimated to be 180 million years).
• The presence of dry beds of rivers (eg Saraswati) indicates that the region was once fertile.
• Geologically, the desert area is a part of the peninsular plateau region but on the surface, it looks like an aggradational plain.

Chief Characteristics:

• The desert proper is called the Marusthali (dead land) as this region has an arid climate with low vegetation cover. In general, the Eastern part of the Marushthali is rocky, while its western part is covered by shifting sand dunes.
• Bagar: Bagar refers to the semi-desert area which is west of Aravallis. Bagar has a thin layer of sand. It is drained by Luni in the south whereas the northern section has a number of salt lakes.
• The Rajasthan Bagar region has a number of short seasonal streams which originate from the Aravallis. These streams support agriculture in some fertile patches called Rohi.
• Even the most important river ‘Luni’ is a seasonal stream. The Luni originates in the Pushkar valley of the Aravalli Range, near Ajmer and flows towards the southwest into the Rann of Kutch.
• The region north of Luni is known as the Thali or sandy plain.
• There are some streams which disappear after flowing for some distance and present a typical case of inland drainage by joining a lake or playa e.g. the Sambhar Lake. The lakes and the playas have brackish water which is the main source of obtaining salt.
• Well pronounced desert land features:
  • Sand dunes: It is a land of undulating topography dotted with longitudinal dunes, transverse dunes and barchans. [Barchan – A crescent-shaped sand dune, the horns of which point away from the direction of the dominant wind; Longitudinal dune – A sand dune with its crest running parallel to the direction of prevailing wind]

• Mushroom rocks
• Shifting dunes (locally called Dhrians)
• Oasis (mostly in its southern part)

THE COASTAL PLAINS

Of the total coastline of India (7517 km), that of the peninsula is 6100 km between the peninsular plateau and the sea. The peninsular plateau of India is flanked by narrow coastal plains of varied width from north to south.

On the basis of the location and active geomorphologic processes, these can be broadly divided into two parts:

• The western coastal plains
• The eastern coastal plains.

We now take them up one by one:

The Western Coastal Plain

1. Extent: The Western Coastal Plains are a thin strip of coastal plains with a width of 50 km between the Arabian Sea and the Western Ghats.

2. Subdivisions: Extending from the Gujarat coast in the north to the Kerala coast in the south, the western coast may be divided into following divisions:

• Kachchh and Kathiawar coast in Gujarat,
• Konkan coast in Maharashtra,
• Goan Coast in Karnataka, and
• Malabar coast in Kerala

Note: Kutch and Kathiawar, though an extension of Peninsular plateau (because Kathiawar is made of the Deccan Lava and there are tertiary rocks in the Kutch area), they are still treated as an integral part of the Western Coastal Plains as they are now levelled down.

3. A coastline of submergence: The western coastal plains are an example of the submerged coastal plain. It is believed that the city of Dwaraka which was once a part of the Indian mainland situated along the west coast is submerged underwater.

4. Characteristic Features:

• The western coastal plains are narrow in the middle and get broader towards north and south. Except for the Kachchh and Kathiawar coastal region, these are narrower than their eastern counterpart.
• The coast is straight and affected by the South-West Monsoon winds over a period of six months. The western coastal plains are thus wetter than their eastern counterpart.
• The western coast being more indented than the eastern coast provides natural conditions for the development of ports and harbours. Kandla, Mazagaon, JLN port Navha Sheva, Marmagao, Mangalore, Cochin, etc. are some of the important natural ports located along the west coast.
• The western coastal plains are dotted with a large number of coves (a very small bay), creeks (a narrow, sheltered waterway such as an inlet in a shoreline or channel in a marsh) and a few estuaries. The estuaries, of the Narmada and the Tapi are the major ones.
• The rivers flowing through this coastal plain do not form any delta. Many small rivers descend from the Western Ghats making a chain of waterfalls.
• The Kayals – The Malabar coast has a distinguishing feature in the form of ‘Kayals’ (backwaters). These backwaters are the shallow lagoons or the inlets of the sea and lie parallel to the coastline. These are used for fishing, inland navigation and are important tourist spots. The largest of these lagoons is the Vembanad lake. Kochi is situated on its opening into the sea.

The Eastern Coastal Plain

1. Extent: The Eastern Coastal Plains is a strip of coastal plain with a width of 100 – 130 km between the Bay of Bengal and the Eastern Ghats

2. Subdivisions: It can be divided into two parts:

• Northern Circar: The northern part between Mahanadi and Krishna rivers. Additionally, the coastal tract of Odisha is called the Utkal plains.
• Coromandel Coast (or Payan Ghat): The southern part between Krishna and Kaveri rivers.

3. A coastline of emergence: The eastern coastal plain is broader and is an example of an emergent coast.

4. Characteristic features:

• The eastern coastal plains are wider and drier resulting in shifting sand dunes on its plains.
• There are well-developed deltas here, formed by the rivers flowing eastward in to the Bay of Bengal. These include the deltas of the Mahanadi, the Godavari, the Krishna and the Kaveri.
• Because of its emergent nature, it has less number of ports and harbours. The continental shelf extends up to 500 km into the sea, which makes it difficult for the development of good ports and harbours.
• Chilika lake is an important feature along the eastern coast. It is the largest saltwater lake in India.

Significance of the Coastal Plains region:

1. These plains are agriculturally very productive. The western coast grows specialized tropical crops while eastern coasts witnessed a green revolution in rice.
2. The delta regions of eastern coastal plains have a good network of canals across the river tributaries.
3. Coastal plains are a source of salt, monazite (used for nuclear power) and mineral oil and gas as well as centres of fisheries.
4. Although lacking in adequate natural harbours, with a number of major and minor ports, coastal plains are centres of commerce and have attracted dense human settlements.
5. The coastal regions of India are noted for tourist centres, fishing and salt making.

THE ISLANDS

There are two major island groups in India

1. The island groups of Bay of Bengal: Andaman & Nicobar Islands
2. The island groups of Arabian Sea: Lakshadweep and Minicoy Islands

Let’s take these up one by one:

Andaman & Nicobar Islands:

• Also called the emerald islands.
• Location and Extent:
  • These are situated roughly between 6°N-14°N and 92°E -94°E.
  • The most visible feature of the alignment of these islands is their narrow longitudinal extent.
  • These islands extend from the Landfall Island in the north (in the Andamans) to the Indira Point (formerly known as Pygmalion Point and Parsons Point) in the south (In the Great Nicobar).
• Origin: The Andaman and Nicobar islands have a geological affinity with the tertiary formation of the Himalayas, and form a part of its southern loop continuing southward from the Arakan Yoma.
• The entire group of islands is divided into two broad categories:
  • The Andaman in the north, and
  • The Nicobar in the south.

They are separated by a water body which is called the Ten-degree channel.

• The Andaman islands are further divided into:
  • Great Andamans
    • North Andaman
    • Middle Andaman
    • South Andaman
  • Little Andaman

Little Andaman is separated from the Great Andamans by the Duncan Passage.

• Chief Characteristics:
  • These are actually a continuation of Arakan Yoma mountain range of Myanmar and are therefore characterized by hill ranges and valleys along with the development of some coral islands.
  • Some smaller islands are volcanic in origin e.g. the Barren island and the Narcondam Island. Narcondam is supposed to be a dormant volcano but Barren perhaps is still active.
  • These islands make an arcuate curve, convex to the west.
  • These islands are formed of granitic rocks.
  • The coastal line has some coral deposits and beautiful beaches.
  • These islands receive convectional rainfall and have an equatorial type of vegetation.
  • These islands have a warm tropical climate all year round with two monsoons.
  • The Saddle peak (North Andaman – 738 m) is the highest peak of these islands.
  • The Great Nicobar is the largest island in the Nicobar group and is the southernmost island. It is just 147 km away from the Sumatra island of Indonesia.

Lakshadweep Islands:

• These islands were earlier (before 1^st November 1973) known as Laccadive, Minicoy and Amindivi Islands.
• Location:
  • These are scattered in the Arabian Sea between 8°N-12°N and 71°E -74°E longitude.
  • These islands are located at a distance of 280 km-480 km off the Kerala coast.
• Origin: The entire island group is built of coral deposits.
• Important islands:
  • Amindivi and Cannanore islands in the north.
  • Minicoy (lies to the south of the nine-degree channel) is the largest island with an area of 453 sq. km.

• Chief Characteristics:
  • These consist of approximately 36 islands of which 11 are inhabited.
  • These islands, in general, have a north-south orientation (only Androth has an East-West orientation.
  • These islands are never more than 5 metres above sea level.
  • These islands have calcium-rich soils- organic limestones and scattered vegetation of palm species.
  • One typical feature of these islands is the formation of the crescentic reef in the east and a lagoon in the west.
  • Their eastern seaboard is steeper.
  • The Islands of this archipelago have storm beaches consisting of unconsolidated pebbles, shingles, cobbles and boulders on the eastern seaboard.
  • The islands form the smallest Union Territory of India.

Other than the above mentioned two major groups, the important islands are:

1. Majauli: in Assam. It is:
   1. The world’s largest freshwater (Brahmaputra river) island.
   2. India’s first island district
2. Salsette: India’s most populous island. Mumbai city is located on this island.
3. Sriharikota: A barrier island. On this island is located the satellite launching station of ISRO.
4. Aliabet: India’s first off-shore oil well site (Gujarat); about 45 km from Bhavnagar, it is in the Gulf of Khambat.
5. New Moore Island: in the Ganga delta. It is also known as Purbasha island. It is an island in the Sunderban deltaic region and it was a bone of contention between India and Bangladesh. In 2010, it was reported to have been completely submerged by the rising seawater due to Global warming.
6. Pamban Island: lies between India and Sri Lanka.
7. Abdul Kalam Island: The Wheeler Island near the Odisha coast was renamed as Abdul Kalam island in 2015. It is a missile launching station in the Bay of Bengal. The first successful land-to-land test of the Prithvi Missile was conducted from the mainland and it landed on the then uninhabited ‘Wheeler Island’ on November 30, 1993.

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Dear Aspirants,

This Spotlight is a part of our Mission Nikaalo Prelims-2023.

You can check the broad timetable of Nikaalo Prelims here

Session Details

YouTube LIVE with Parth sir – 1 PM  – Prelims Spotlight Session

Evening 04 PM  – Daily Mini Tests

Join our Official telegram channel for Study material and Daily Sessions Here

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10th Apr 2023

Important Seas and Mountain Ranges in the World

Tasman Sea

The Tasman Sea is a marginal sea of the South Pacific Ocean, situated between Australia and New Zealand. It measures about 2,000 kilometres (1,200 mi) across and about 2,800 kilometres (1,700 mi) from north to south. The sea was named after the Dutch explorer Abel Janszoon Tasman, who was the first recorded European to encounter New Zealand and Tasmania. The British explorer Captain James Cook later extensively navigated the Tasman Sea in the 1770s as part of his first voyage of exploration.

Persian Gulf

This inland sea of some 251,000 square kilometres (96,912 sq mi) is connected to the Gulf of Oman in the east by the Strait of Hormuz; and its western end is marked by the major river delta of the Shatt al-Arab, which carries the waters of the Euphrates and the Tigris. Its length is 989 kilometres (615 miles), with Iran covering most of the northern coast and Saudi Arabia most of the southern coast. The Persian Gulf is about 56 km (35 mi) wide at its narrowest, in the Strait of Hormuz. The waters are overall very shallow, with a maximum depth of 90 metres (295 feet) and an average depth of 50 metres (164 feet).

Countries with a coastline on the Persian Gulf are (clockwise, from the north): Iran; Oman’s exclave Musandam; the United Arab Emirates; Saudi Arabia; Qatar, on a peninsula off the Saudi coast; Bahrain, on an island; Kuwait; and Iraq in the northwest. Various small islands also lie within the Persian Gulf, some of which are the subject of territorial disputes between the states of the region.

Mediterranean Sea
The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Southern Europe and Anatolia, on the south by North Africa, and on the east by the Levant. The sea is sometimes considered a part of the Atlantic Ocean, although it is usually identified as a separate body of water.

The countries with coastlines on the Mediterranean Sea are

1. Albania
2. Algeria
3. Bosnia and Herzegovina
4. Croatia
5. Cyprus
6. Egypt
7. France
8. Greece
9. Israel
10. Italy
11. Lebanon
12. Libya
13. Malta
14. Morocco
15. Monaco
16. Montenegro
17. Slovenia
18. Spain
19. Syria
20. Tunisia
21. Tukey

In addition, the Gaza Strip (“Palestine” has been associated with the geographical area that currently covers the State of Israel, the West Bank and the Gaza Strip) and the British Overseas Territories of Gibraltar and Akrotiri and Dhekelia have coastlines on the sea.

Black Sea

The Black Sea is a marginal sea of the Atlantic Ocean. It has an area of 436,400 km² (168,500 sq mi) (not including the Sea of Azov). The roughly oval-shaped Black Sea occupies a large basin strategically situated at the southeastern extremity of Europe but connected to the distant waters of the Atlantic Ocean by the Bosporus (which emerges from the sea’s southwestern corner), the Sea of Marmara, the Dardanelles, the Aegean Sea, and the Mediterranean Sea.

Countries bordering the Black Sea are-

1. Ukraine
2. Russia
3. Georgia
4. Turkey
5. Bulgaria
6. Romania

Caspian Sea

The Caspian Sea is the largest enclosed inland body of water on Earth by area, variously classed as the world’s largest lake or a full-fledged sea. It is in an endorheic basin (a basin without outflows) located between Europe and Asia.

The Caspian Sea is bordered on the northwest by Russia, on the northeast by Kazakhstan, on the west by Azerbaijan, on the southeast by Turkmenistan, and on the south by Iran. It is classified as both a sea and a lake, and it is the largest enclosed inland body of water in the world.

1. Azerbaijan
2. Iran
3. Kazakhstan
4. Russia
5. Turkmenistan

Red Sea

The Red Sea (also the Erythraean Sea) is a seawater inlet of the Indian Ocean, lying between Africa and Asia. The connection to the ocean is in the south through the Bab el Mandeb strait and the Gulf of Aden. To the north lie the Sinai Peninsula, the Gulf of Aqaba, and the Gulf of Suez (leading to the Suez Canal). The sea is underlain by the Red Sea Rift which is part of the Great Rift Valley.

The salinity of the Red Sea is greater than the world average, approximately 4 percent. This is due to several factors:

• Lack of significant rivers or streams draining into the sea.
• Limited connection with the Indian Ocean, which has lower water salinity.
• High rate of evaporation and very little precipitation.

The six countries bordering the Red Sea proper are:

Eastern shore:

• Saudi Arabia
• Yemen

• Western shore:
  • Egypt
  • Sudan
  • Eritrea
  • Djibouti

Aral Sea

The Aral Sea was an endorheic lake lying between Kazakhstan (Aktobe and Kyzylorda Regions) in the north and Uzbekistan (Karakalpakstan autonomous region) in the south. The name roughly translates as “Sea of Islands”, referring to over 1,100 islands that once dotted its waters; in the Turkic languages aral means “island, archipelago”.

South China Sea

The South China Sea is a marginal sea that is part of the Pacific Ocean, encompassing an area from the Karimata and Malacca Straits to the Strait of Taiwan of around 3,500,000 square kilometres (1,400,000 sq mi). The area’s importance largely results from one-third of the world’s shipping sailing through its waters and that it is believed to hold huge oil and gas reserves beneath its seabed.

It is located

• south of China;
• east of Vietnam and Cambodia;
• northwest of the Philippines;
• east of the Malay peninsula and Sumatra, up to the Strait of Malacca in the western, and
• north of the Bangka–Belitung Islands and Borneo

Ross sea

The Ross Sea is a deep bay of the Southern Ocean in Antarctica, between Victoria Land and Marie Byrd Land. It derives its name from the British explorer James Ross who visited this area in 1841. To the west of the sea lies Ross Island and to the east Roosevelt Island, while the southernmost part is covered by the Ross Ice Shelf, and is about 200 miles (320 km) from the South Pole.

Weddel sea

The Weddell Sea is part of the Southern Ocean and contains the Weddell Gyre. Its land boundaries are defined by the bay formed from the coasts of Coats Land and the Antarctic Peninsula. The easternmost point is Cape Norvegia at Princess Martha Coast, Queen Maud Land. To the east of Cape Norvegia is the King Haakon VII Sea. Much of the southern part of the sea is covered by a permanent, massive ice shelf field, the Filchner-Ronne Ice Shelf .
The sea is named after the Scottish sailor James Weddell, who entered the sea in 1823 and originally named it after King George IV; it was renamed in Weddell’s honour in 1900.

Mountain Ranges

Sr. No.	Mountain Range	Important/Highest Peaks	Location	Description
1	Rocky Mountains	Mt. Elbert (highest peak in the Rockies)	North America	It is one of the longest fold mountains in the world and extends from Canada to Western US (New Mexico State)
2	Appalachian Mountains	Mt. Mitchell, North Carolina, US (highest peak of Appalachian Mountains)	North America	It is a fold mountain with rich in mineral resources
3	Alps	Mont Blanc (French –Italian border)	Europe	It is a folded mountain and source for rivers like Danube, Rhine, etc.
4	Sierra Nevada	Mt. Whitney	California, USA	Habitat for many Red Indian tribes
5	Alaska Range	Mt. McKinley	North America	Mt. McKinley highest peak in North America
6	Altai Mountains	Belukha mountain	Central Asia	Young folded mountain which extends from Kazakhstan to northern China.
7	Andes Mountains	Mt. Aconcagua	South America	Longest mountain chain in the world
8	Atlas Mountains	Mt. Toubkal	Northwestern Africa	Young fold mountain spreading over Morocco and Tunisia.
9	Drakensberg Mountains	Mt. Lesotho	South Africa	Young folded mountain
10.	Caucasus Mountain	Mt. Elbrus	Europe	Located between the Black Sea and the Caspian Sea
11.	Ural Mountains	Mt. Narodnaya	Russia	This mountain range act as a boundary between Europe and Asia.
12.	Hindukush Mountains	Mt. Trich Mir	Pakistan and Afghanistan	Folded mountain with rugged topography which makes it difficult for transportation.
13.	Himalayas	Mt. Everest	Asia	Young fold mountains in Asia which separates Indian sub-continent from Asian plains
14.	Arakan Yoma	Mt. Kennedy peak	Myanmar	It extends from north to south direction. Shifting cultivation is practised.
15.	Kunlun Mountains	Mt. Muztag	North of Tibetan plateau and western China	It is one of the young folded mountains.
16.	Vosges	Mt. Grand Ballon	Eastern France, Europe	Famous for the cultivation of grapes and manufacture of wines.
17.	Great Dividing Range	Mt. Kosciuszko	Australia	This range is the source for the rivers Darling and Murray.

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Important Straits, Deserts and Volcanoes

Important Volcanoes, Straits and Deserts:

• Vezuvias : Italy 
• Etna : Italy 
• Stromboli : Italy 
• Barren : India (Andaman Nicobar) 
• Kilimancharo : Tanzania 
• Krakathove : Indonesia 
• Pina thubo : Philippense 
• Ring of fire : Pacific 
• Lighthouse of the Pacific : Ezalko 
• Lighthouse of the Mediteranian : Stromboli 
• Important Deserts:
• Fozil desert : Kalahari 
• Little Sahara : Australia 
• Death desert : Thakkala Makkan 
• Painted desert : North America 
• Coldest desert : Gobi 
• Warmest desert : Sahara 
• Driest desert : Attakkama 
• Great Indian desert : Thar 
• Roob Asavali : Asia 
• Attakkama : South America 
• Sahara : Africa 
• Kalahari : Africa 
• Nameeb : Nameebia 
• Great Sandy : Australia 
• Great Victoria : Australia 
• Thakkala Makkan : China 
• Sahel : China 
• Thar : India 

The following table lists the major straits in the world:

Strait	Contiguous Landmass	Joining Seas/Water Bodies
Formosa Strait	China and Taiwan	The South China Sea and the East China Sea
Strait of Tartary	Russia (East Russia-Sakhalin Islands)	Sea of Okhotsk and the Sea of Japan
Yucatan Strait	Mexico and Cuba	The Gulf of Mexico and the Caribbean Sea
Mesina Strait	Italy and Sicily	The Tyrrhenian Sea and the Ionian Sea, within the central Mediterranean
Otranto Strait	Italy and Albania	Adriatic Sea & Ionian Sea
Cook Strait	New Zealand	The Tasman Sea and South Pacific Ocean
Mozambique Channel	Mozambique and Madagascar	Indian Ocean
North Channel	Ireland and Scotland	Irish Sea and Atlantic Ocean
Hormuz Strait	Iran and Oman	The Gulf of Oman and the Persian Gulf
Bab-el-Mandeb	Djibouti, Yemen, and Eritrea of the Somali Peninsula	The Gulf of Aden and the Red Sea
Ten Degree Channel	Car Nicobar Islands and Little Andaman	Andaman Sea and the Bay of Bengal
Sunda Strait	Java island of Indonesia with its Sumatra island.	Java Sea and the Indian Ocean
Florida Strait	Cuba and the USA	Gulf of Mexico and the Atlantic Ocean
Bering Strait	Asia from America	The Arctic Ocean and East Pacific ocean
Strait of Gibraltar	Spain and Morocco	The Atlantic Ocean and the Mediterranean Sea
Korea Strait	Japan and South Korea	The East China Sea and the Sea of Japan
Strait of Malacca	Malaysia and Sumatra	The Pacific Ocean to the east with the Indian Ocean to the west
Bonifacio Strait	Corsica island of France and Sardinia islands of Italy	The Tyrrhenian Sea and the Mediterranean Sea
Palk Strait	India and Sri Lanka	The Bay of Bengal in the northeast with the Palk Bay/Arabian Sea in the southwest
Bosphorus Strait	Divides Europe from Asia	The Black Sea to Sea of Marmara
Bass Strait	Tasmania island and mainland Australia	The Great Australian Bight and the Tasman Sea
Davis Strait	Between Greenland and Canada	The Baffin Bay and the Labrador Sea
Jamaica Channel	Jamaica and Hispaniola	The Caribbean Sea and North Atlantic
Hudson Strait	Baffin Island and Labrador peninsula	Hudson Bay and the Labrador Sea

Dear Aspirants,

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7th Apr 2023

Important Historical Sculpture and Paintings

		Famous Sculpture/                             Painting	Era/ Dynasty	Monument
		Bodhisattva Padmapani	Gupta Period	Ajanata
		Mahakapi Jataka	Sunga	Bharhut stupa
		Torso of Vishnu	Gupta Period	Mathura
		Stupa worship	Mauryan/Sunga period	Bharhut stupa
		Yakshini	Mauryan/Sunga period	Bharhut stupa
		Queen Maya’s dream	Mauryan/Sunga period	Bharhut stupa
		Painting of Yashodahara,Rahul & buddha	Gupta Period	Ajanata
		Standing Buddha	Gupta Period	Sarnath
		Seated Buddha	Kushanas	Mathura
		Standing Buddha	Kushanas	Gandhara
		Mara Vijaya	Multiple period	Ajanta
		Maheshmurthi	Rashtrakuta Period	Elephanta caves
		Shiva chasing boar	Vijaynagara Period	Lepakshi temple
		Shiva killing Tripurasura		Thanjavoor
		Dakshinamurthy	Vijaynagara Period	Lepakshi temple
		Ladies attending Parvathy	Vijaynagara Period	Lepakshi temple
		Krishna playing the flute		Pundareekapuram temple
		Sheshashayana Vishnu	Gupta Period	Dashavtar temple
		Vishnu in Nara-Narayan form	Gupta Period	Dashavtar temple
		Arjun Penance	Pallavas	Mahabalipuram
		Statue of Suparshvanatha	Pallavas
		Statue of Gommateshwara,	Ganga Dynasty	Shravanbelagola, Karnataka
		Yakshi	Mauryan Period	Didarganj
		Durga with eight arms shown in the act of defeating Mahishasura,	Pallavas	Mahishasura Mardini Cave, Mahabalipuram
		Ravana Shaking Mount Kailasha	Rashtrakuta	Ellora
		Nandi bull	Cholas	Brihadeshwara temple
		Kalyana Sundara Murthy	Rashtrakuta	Ellora
		Nayika	Ganga Dynasty	Lingraj temple
		Nataraja	Cholas	Brideshwar temple
		Manjira player	Ganga Dynasty	Surya Mandir,Odhisa
		Mohini	Hoysalas	Chennakeshava temple
		Pillars with horse rider	Naykas	Meenakshi temple
		Worship of Bodhi tree	Mauryan Period	Bharhut
		Animals worshipping Bodhi tree	Sungas	Sanchi
		Yakshini	Sungas	Sanchi
		Taming of Nalagiri elephant	Mauryan Period	Amravati
		Head of Buddha	Kushanas	Gandhara
		Seated Buddha	Kushanas	Mathura
		Dwarfish Yaksha		Pithalkoda caves
		Five Ratha	Pallavas	Mahabalipuram
		Vrikshika	Sunga	Sanchi Stupa
		Buddha’s Great departure	Kushanas	Gandhara
		Indra flying amid clouds together with celestial nymphs	Gupta Period	Ajanta

The following table contains the tribes in India, significant aspects of their life, and festivals they celebrate.

	Name of the tribe	States/ Region	Significant aspects related to the tribe	Festivals
	Munda	Chota Nagpur Plateu	1.Christianity is their main religion. 2..They speak Mundari which is austro-asiatic Language.	Main festivals of Munda tribe are Mage Parab , Ind-Parab Jom-Nagoa or Jom Nawa ,Batauli ,Kolom Sing ,Phagu Festival ,Sarhul or Ba Parab ,Karam and Sohrai Festival
	Santhals	West Bengal, Bihar, Orissa, Jharkhand and Assam.	1.Santhals are the third largest tribe in India. 2.Santhals speak Santhali, which belongs to the Austro- Asiatic language family. Santhals have their script called Olchiki, which was developed by Dr Raghunath Murmu in 1925. 3.Santhals have no temples of their own. They even do not worship any idols. Santhals follow the Sarna religion.	Santhals mainly celebrate the Karam festival which falls in the month of September and October
	Angami	Nagaland	1.Men wear shawls called white Mhoushu and the black Lohe. The women wear Mechala – the wrap around skirt and shawls of unique designs and patterns 2.Christianity is the major religion followed among the Angami tribal people 3.Angamis are quite popular for their woodcraft and artwork.	Sekrenyi is the main festival celebrated among the Angamis in Nagaland.
	Bhils	The central Bhils are found in the mountain regions in the Indian states of Madhya Pradesh, Maharashtra, Gujrat and Rajasthan. Bhils are also found in the north eastern parts of Tripura.	1.Religion practice among the Bhils differ from place to place. Most of them worship local deities like Khandoba, Kanhoba, Bahiroba, and Sitalmata. Some of the worship Tiger God called ‘vaghdev’. They have no temples of their own. 2.Ghoomar is the most famous dance among the Bhils. 3.Than Gair is the religious dance drama performed by the men in the month of Sharavana (July and August)	The Baneshwar fair is the main festival celebrated among the Bhils. This fair is held during the period of Shivatri (in the month of January or February) and is dedicated to Baneshwar Mahadev also known as Lord Shiva. On this occasion Bhils gather all together set up camps on the banks of the Som and Mahi river.
	Chenchus	Chenchu inhabit in the Nallamalai hills, which have been the part of the Nagarjuna Sagar Tiger Sanctuary for centuries in Andhra Pradesh India.	1.Chenchus talk in Chenchu language with the Telgu accent. Their language is also known as Chenchucoolam, Chenchwar, Chenswar or Choncharu. 2.Chenchus worship number of deities. They mainly believe in Bhagaban taru who lives in the sky and look after the Chenchus in all their doings. Another deity they worship is Garelamai Sama, who is the Goddess of forest.
	Khasis	Khasi tribe is mainly found in the sate of Assam and the Khasi Jaintia hills in Meghalaya	1.Khasis speak Khasi, which is an Austro- Asiatic language. It is the part of the Mon-Khmer group of languages. 2.Khasis have a matriachal society. 3.Most of the Khasis follow Christianity as the religion. The Khasi believe in the supreme creator God U Blei Nong-thaw.	Nongkrem is the major festival celebrated among the Khasis.
	Bhuthias	Bhutia tribes are of the Tibetan origin. They migrated to Sikkim around 16th century. In the northern part of the Sikkim where they are the major inhabitants, they are known as the Lachenpas and Lachungpas. Majority of the Bhutias are concentrated in the dry valley of the North Sikkim.	1.Bhutia tribes usually speak Sikkimese. 2.The legal system among the Bhutias is termed as the Dzumsa, which means the rendezvous point of the common masses. 3. Bhutia male wear Bakhu which is a loose traditional dress with the full sleeves. While the women dress consists of Silken Honju, which is the full sleeves blouse	Losar and Losoong are the main festivals celebrated among the Bhutia tribes.
	Gonds	The Gonds are the tribal community mostly found in the Gond forests of central India. They are widely spread in the Chhindwara District of Madhya Pradesh	1.Gonds tribe speak Gondi language which is related to the Telgu and the other Dravidian languages. 2.Gonds have been largely influenced by the Hindus and for the long time have been practicing the Hindus culture and traditions. Gonds are the worshipers of Janani or the mother of creator. 3.Gusadi dance is the most famous dance perfomed by the Gonds.	Gonds fair and festivals are influenced from the Hindu traditions. Keslapur Jathra is the important festival of the Gonds.
	Gaddis	Himachal Pradesh.	1.The main occupation of Gaddi tribes is shepherding and they make their livelihood by rearing and selling sheeps, goats, mules and horses 2. They speak Gaddi langauge	The Namagen dance is performed in the month of September to celebrate the autum. They were costumes which are largely woolen and studded with ornaments of silver. They are worn by women.
	Birhor	Chattisgarh	1.They follow Hinduism and have their indigenous traditional beliefs. ‘Sing Bonga’, is regarded by the people as the supreme god. 2.Birhor tribe is one of the primitive tribes. They belong to the Proto-Australoid stock; linguistically, they originate from the Austro-Asiatic group.
	Garo	Meghalaya	1.In Garo tribes, women are the owners of property thus making it a matrilineal society. 2.most of the Garos adopted Christianity. These tribes speak Garo language, which is also further divided into different sub-languages or dialects.	Wangala is one of the significant festivals of these tribes This festival is celebrated after the harvest of crops as thanks giving ceremony to their deity Salijong
	Zeliang	Nagaland	1.The Zeliang practice wet cultivation or Panikheti and terraced cultivation. They practice Jhum cultivation though they prefer Panikheti. 2.Many have accepted the religion of Christianity.	The Hega festival is one of the most important and the largest festivals among the Zeliang community
	Rengma	Nagaland	1.They belong to the Mongoloid racial stock. The Rengma is a patriarchal society therefore the line of descent is traced through the male side and property rights goes to the male line.   2.The Rengma tribes are agriculturists. They grow paddy through Jhum cultivation and wet cultivation. 3.Traditionally Rengma tribes are worshippers of supernatural beings. The Supreme god is known as Teronyu. Nyensug and Nyensugi are the next important god and goddesses who are worshipped for household wealth. Now most of the Rengma tribes are Christians	Ngada is the most important festival of Rengma tribes. It is celebrated after harvesting the crop or at the end of November or in the beginning of December. Actually it is a “Thanks giving” festival of the Rengma tribes
	Ao	Nagaland	The Ao Nagas are rich in their folk literature. With the arrival of Christian missionaries in the 19th century the Ao were some of the earliest converts to Christianity among the other Naga tribes.	1. The Aos observe Moatsü Mong after the sowing is done. The festival provides them a period of recreation and entertainment after the stressful work of clearing fields, burning jungles, sowing seeds, cleaning up the Tsubu (wells) and repairs and construction of houses by elders of the Putu Menden, stretching over a week. 2.Aos have another festival called Tsüngrem Mong. It is celebrated in the eve of the harvest.
	Lushai	Manipur/Mizoram	1.Lushai tribes have developed expertise in swimming and hunting. That they are good archers are apparent from the fact that they can nicely handle ‘Sairawkher’. 2.The way they dress shows that these Lushai tribes have got aesthetic sense. Lukhum is a special hat worn by the Lushai tribes. It is sharp in shape, mainly prepared from ‘bamboo splits’. Special open-hexagonal weave are used for weaving these hats. 3.For proper administration, the whole of the Lushai society are segregated into clans and castes, nicely run by a village head. Different is the way in which they practice the ‘Sakhua sacrifice’. These Lushai tribes are pious.	There Bamboo dance(known as Cheraw dance) is very famous.
	Hmar	Manipur	1.The society is patrilineal and patriarchal in nature. 2. Hmars worship supernatural beings. Pathien is the supreme god. 3.The Hmars depend on forest products. Their economy can be classified dually -traditional and subsidiary occupations.	Chawn-lam, Dar-lam, Pheipheet-lam, Hrang-lam, Tinna-Hla-lam are the common dances of the Hmar community. All dances are based on the rhythmic tunes of musical instruments.
	Kuki	Manipur	Kuki Tribe of Manipur are mainly followers of Christianity and Judaism.
	Mizo	Mizoram	1.The Mizos are of the Mongoloid racial stock with well built features. 2.They follow Christianity 3.The Mizos are mainly an agricultural people. Jhum cultivation is the traditional form of agriculture that is practiced	The Mizo celebrate many festivals among which Chapchar kut and Pavlkut are most important festivals. Chapchar kut is celebrated in the month of March. It is the spring festival celebrated. Pawl kut is a harvest festival celebrated in the months of December and January.
	Chakesang	Nagaland		Held in between March and April, the Tsukhenyi festival is one of the least known tribal festivals in India that is celebrated with great enthusiasm by the Chakesang Nagass
	Limboos	Sikkim	1.Many Limbu follow a combination of Buddhism and their traditional beliefs. 2.There traditional group dance is called dhannach and is performed during marriage,death or any festivities 3.The traditional dress of Limboos are mekhli and Taga
	Lepchas	Sikkim	1.The Lepchas are the aboriginal inhabitants of Sikkim and they are mostly settled in North Sikkim. They are mostly Buddhist but many of them have now adopted Christianity 2. The traditional cloths of the Lepchas are woven in exquisite colour combinations. Men’s dress is called Thokro-Dum and the female’s dress is called Dumdyam or Dumvum. 3. The Lepcha trace their descent patrilineally. The marriage is negotiated between the families of the bride and the groom.
	Apatani	Aruanchal Pradesh	1.UNESCO has proposed the Apatani valley for inclusion as a World Heritage Site for its “extremely high productivity” and “unique” way of preserving the ecology 2. Women of the Apatani Tribe, in India’s Apatani plateau, are famous for the bizarre nose plugs they’ve been wearing since times long passed.	They have two major festival- Dree and Myoko.
	Nyishis	Aruanchal Pradesh	1.The Nyishi language belongs to the Sino-Tibetan family, however, the origin is disputed. 2.Polygyny is prevalent among the Nyish. 3. The Nyishis, who traditionally wear cane helmets surmounted by the crest of a hornbill beak (known as pudum, padam), have considerably affected the population of this bird. Several organizations, such as the Arunachal Wildlife and Nature Foundation and the Wildlife Trust of India, have been trying to stop the Nyishi hunting these birds in order to protect them from extinction. Nature reserves, such as the Pakke Sanctuary, are being set up to protect the birds, while artificial materials, such as fiberglass, have been introduced as an alternative to the hornbill beak in Nyishi dress.	Nyokum is the festival celebrated by the Nyishi people, a religion which commemorates their ancestors.
	Adis	Aruanchal Pradesh	Adi dances vary from the slow, rustic and beautifully enchanting style Ponung (performed in Solung festival) to the exhilarating, exuberant thumps of Delong performed by Men in Etor festival. These dances have led to certain forms of dancing which jointly narrate a story, the Tapu (War Dance). In the Tapu War Dance, the dancers vigorously re-enact the actions of war, its gory details and the triumphant cries of the warriors. Yakjong is performed in Aran festival.	The Adi celebrate a number of festivals, in particular their prime festivals are Aran, Solung, Etor.Solung, is observed in the first week of September for five days or more. It is a harvest festival performed after the sowing of seeds and transplantation, to seek for future bumper crops. Ponung songs and dances are performed by women folk during the festival
	Sema/Sumi Nagas	Nagaland	1.The ‘Sumi Naga’ is one of the major Naga peoples in Nagaland, India. The Sumis mainly inhabit the Zunheboto district, although many have spread and is now living in a few more districts within Nagaland. 2.Sumi Naga tribe practiced kiti-do and were a headhunter as every other Naga tribals .	Tuluni (July 8) is a festival of great significance for the Sumi. This festival is marked with feasts as the occasion occurs in the bountiful season of the year. Drinking rice beer indispensably forms as part of the feasts. Rice beer is served in a goblet made of bamboo or made from the leaf of plantain. This drink is called Tuluni which gives the festival its name.
	Konyak tribe	Nagaland	The Konyak are a Naga people, and are recognised among other Naga by their tattoos, which they have all over their face and hands; facial tattoos were earned for taking an enemy’s head. They are called the land of Angh’s. They have the largest population among the Nagas.	Aoleang is the biggest festival for the Konyak. They wear their traditional attire and sing folk song to celebrate the Aoleang festival.
	Reang	Tripura	1.The Reangs are basically a semi-nomadic tribe who practice jhum (slash and burn) or shifting method of cultivation on the hill sides. 2. The Reang basically belonged to the Mongoloid group and speaks the Tibeto-Burmese language ‘Kau Bru	The Hodaigri dance amongst the Reang (Bru) was usually performed on the occasion of Maikhlungmo rituals i.e. worship of Goddess of food grains and cotton especially during the month of September-October
	Mishing	Assam	1.The Mishing tribe is the second largest tribe among the other tribes of North- East India. 2.Traditionally Mishing people live near the bank of river and they build their “Chang Ghar” with the help of timber bamboo, thatch, etc for comfort living.	Mishing people are easy going, very simple living and are fond of festivals. The main festival is “Ali-Aye-Ligang” which is the most colourful spring festival held every year on first Wednesday of the month “Gimur polo”(Feb-March).
	Karbi	Assam	1.The Karbis believes in animism which consists of such a belief in the role of spiritual beings in human life. 2. Various types of dances are performed by the youths during the performances of Chomangkan, the death ceremony and other socio-religious festivals. The Karbis have very limited number of musical instruments. A big drum called Cheng is their main musical instrument.	A number of festivals are observed by the people belonging to Karbi tribal group. Like for instance, they celebrate ‘Chojun Puja’ or ‘Swarak Puja’, ‘Rongker’, ‘Chokk-eroi’, ‘Hacha-Kekan’, ‘Chomangkan’.
	Mikir	Assam
	Kols	Madhya Pradesh	Most of these tribes are landless labourer. They prefer to live in groups near villages called Kolhan
	Bonda	Odhisa	The Bonda are an ancient tribe of people who live in the isolated hill regions of the Malkangiri district of southwestern Odisha, India,
	Oarons	Odhisa,Bihar and Jharkhand	1.Oraon also called Kurukh, aboriginal people of the Chota Nagpur region in the state of Jharkhand, India. They call themselves Kurukh and speak a Dravidian language akin to Gondi and other tribal languages of central India. 2.Speakers of Oraon number about 1,900,000, but in urban areas, and particularly among Christians, many Oraon speak Hindi as their mother tongue. 3.It was long thought that the Oraons and the other tribals were animists, people who attribute a living soul to plants, inanimate objects and natural phenomena. This view has been discarded although amateur anthropologists still sort it out in articles, in popular magazines. The Oraons are not nature worshipers.
	Murias	Chattisgarh	1.The Muria are an adivasi (scheduled tribe) of the Bastar district of Chhattisgarh, India. They are part of the Gondi people. 2.They have mixed-sex dormitories where adolescents are sent to practice premarital sex, sometimes with a single partner and sometimes serially. 3.The Muria are traditionally animists, with village and clan deities
	Korba	Chattisgarh	Famous for there Karma dance
	Sahariya	Rajasthan	1.Sahariya Tribe is the only primitive tribe of the Rajasthan state 2.They follow Hindu religious practices and speak a dialect influenced by Hadoti.
	Irulas	Tamil Nadu	1. They inhabit the area of the Nilgiri mountains, in the states of Tamil Nadu and Kerala, India 2.Early 20th century anthropological literature classified the Irular under the Negrito ethnic group. 3.Unlike the Negrito tribes in the Andaman Islands who have retained their language, Irular speak the Irula language, a Dravidian language that is closely related to Tamil, Yerukala, Sholaga and other Tamil languages
	Badagas	Tamil Nadu	1.The Badagas live in the Nilgiri Hills of Tamil Nadu, India. They speak the unwritten Badaga language and are the one of the social groups in Nilgiris 2.Thundu (a white piece of cloth) forms an integral part of the attire of Badaga women and as a cultural item, is presented to visiting dignitaries as a gesture of good will.	Their important festival is Hethai Habba.
	Uralis	Kerela	1.The Urali tribes like most of the tribes in south India, worship nature as Gods and inventor of the world. They consider the Sun as ‘the creator of all souls’ and moon as the mother of all creation. 2.The Uralis generally do not engage in inter-tribal marriage, instead they prefer to marry within their own tribe. It is custom amongst them to wear a sacred thread on special occasions like weddings and funerals.
	Jarawas	Andaman & Nicobar Island	1.The Jarawa are still at the primitive stage of life on earth. They entirely depend upon forest and sea for food. Wild boar and monitor lizard are consumed. Various kinds of fruit , honey and tubers are parts of their diet too. 2.The jarawas of both sexes go complete naked. However some ornaments made with shells and palm leaves are worn by them but these are not in the sense to cover their nudity. This tribe has lived in the southeast part of Andaman but after the British regime they shifted to the western region of the island. They have forever been hunter gatherers in the true sense however things have changed since the 1990’s specially after the building of the old trunk road.
	Sentinelese	Andaman & Nicobar Island	1.The Sentinelese people are said to be so hostile that their home has been named the ‘hardest place to visit’ in the world.The Sentinelese and other indigenous Andamanese peoples are frequently described as negritos, 2.They inhabit the North Sentinel island, and are the only remaining tribe in the Andamans to still maintain their isolation from the rest of the world. Nobody knows exactly how they look, the population or how they live. Since 1967, the indian governments with the help of anthropologists have tried to make contact with the tribe. They tried giving gifts of food, coconuts, etc but they were always met with hostility. The tribe showers arrows and stones at whoever comes near the island. .
	Onge	Andaman & Nicobar Island	Onges are one of the most primitive tribes in India. They belong to the Negrito racial stock and they have been mainly seen near the Dugong creek in Little Andaman. They are dependent on the food provided by nature and are a semi-nomadic tribe. The onge population fell post british colonization from 672 in 1986 to 92 in 1901 but has remained stable since.
	Shompen	Andaman & Nicobar Island	The Shompens, who live in the Great Nicobar island, are a semi-nomadic people. They wander in their forest and coastal habitat in search of fruits and games. There are two territorial groups among the Shompens; The habitation of Shompens is the Great Nicobar which is the largest among the Nicobar group of Islands. Like the Nicobarese, they belong to the Mongoloid race.
	Pangwal	Himachal Pradesh.	1.These rugged people, who are Hindus, have their unique customs, traditions, and institutions. The native Pangwals and Bhotis are robust, hardworking, handsome people who keep the valley’s unique culture alive in folk songs, music and tribal dances.	Music, dance and the locally brewed liquor ‘patar’, play a significant role in the life of the Pangwals. One of the major festivals celebrated towards the end of February is ‘Jukaru’
	Sherdukpen	Aruanchal Pradesh	1.The Sherdukpen language is part of the Kanauri branch of the Tibeto-Burman family. 2.Bardo Chham is a folk dance of Sherdukpens, a small community of West Kameng District of Arunachal Pradesh, Bardo Chham is based on the stories of good and evil. According to the local beliefs, there are both good and evil in mankind. The Sherdukpens mask themselves representing the different animals and dance to show an act of fighting the evil forces.
	Wattal tribe	Jammu & Kashmir	Dumhal dance is performed by Wattal tribe on special occassions
	Bhutias	Sikkim	1.The Bhutia are a community of people of Tibetan ancestry, who speak Lhopo or Sikkimese, a Tibetan dialect fairly mutually intelligible to standard Tibetan 2. Singhi Chham or Kanchendzonga Dance is a dance form in Sikkim whereby the dancers perform in a lion costume that represents the snow lion. It is a dance of the Bhutia people
	Todas	Tamil Nadu	Tribals of Nilgiri hills

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Dear Aspirants,

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You can check the broad timetable of Nikaalo Prelims here

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Evening 06:30  PM  – TIKDAM/MCQs Session

Noon 03:00 PM – CSAT Google Meet Session

Evening 08 PM  – Tests on Alternate Days

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28th Marc

Dear Aspirants,

This Spotlight is a part of our Mission Nikaalo Prelims-2023.

You can check the broad timetable of Nikaalo Prelims here

Session Details

YouTube LIVE with Parth sir – 1 PM  – Prelims Spotlight Session

Evening 04 PM  – Daily Mini Tests

Join our Official telegram channel for Study material and Daily Sessions Here

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6th Apr 2023

 

Important officers and their role in the Maurya Empire

1. Sannidhata – Treasurer and keeper of the stores in Maurya Period. He was in charge of the collection of revenue from various parts of the kingdom and looked after the income and expenditure by supervising the works of akshapataladhyaksha (Accountant-General)
2. Samharta– His function was to collect Revenue both in cash and kind.
3. Amatyas–They were some sort of administrative personnel or civil servants who filled the highest administrative and judicial appointments.
4. Rajukas–Ashoka appointed a class of officers known as the Rajukas, who were vested with the authority of rewarding as well we punishing people.
5. Adhyaksas-­ The officers who looked after the various departments.
6. Yuktas- They appear to have been the subordinate official whose duties were largely secretarial works and accounting.
7. Gopa and Sthanika- There was an intermediate level of administration between the district level and village level, which was administered by the Gopa and Sthanikas.
8. Gramika- Head of the village. He was not a paid servant and was chosen among village elders.
9. Grambhojaka- Gramika was helped by Grambhojaka.
10. Pramukha- Eighteen chief handicrafts of the time were organised in guilds called as Shrenis, the president of Shrenis was known as Pramukha.

Important officers of the Gupta empire

1. Uparika- He was directly appointed by the king as a provincial governor.
2. Kumaramatyas- A link between the central and the provincial administration under the Guptas was provided by the officers called Kumaramatyas and Ayuktas. Kumaramatyas was a body of top-ranking officials attached not only to the king but also to the crown-prince and sometimes placed in charge of district.
3. Gopasramin- In Samudraguptas period an officer working as akshapataladhikrita. Their function was to enter numerous matters in the accounts register, recover royal dues and to check embezzlement and recover fines.
4. Sandhivigrahika-The foreign minister, minister of war and peace. First appeared under the rule of Samudragupta.
5. Mahabaldikarta-Commander-in-Chief.
6. Mahadandanayaka-
7. Mahapratihara- Chief of palace guards.
8. Pustapala- Record-keeper. Maintained record of land transactions in a district. They were also known as Karanika.
9. Vishaya- Vishayas were divided into smaller parts called Vithis which were the villages and consisted of the lowest unit of administration.
10. Mahattama,Mahattaka and Mahattara- Elder who assisted the Gramika in the village administration.
11. Agharikas- During the reign of Harsha, Agharikas looked after the land given in charity.
12. Samantas- Feudal chiefs.

Important officers of Satvahana Period

1. Uparakshita- In Satvahanas kingdom, their function was building caves for monks.
2. Gaulamika- Administration of the villages was placed under them in the Satvahana period.
3. Valaikkarars- Troops in the royal service and were the bodyguard of the monarch.

Medieval India

Amils– Revenue officers

Arz-i-mamalik– Minister in-charge of the army of the whole country.

Ahl-i-qalam– Reporter

Baqqal– Trader, grain-dealer

Batai– Division of crop between the cultivator and landlord or the government, payments may be in

kind or cash

Barid- An intelligence officer appointed by the state to collect information

Chachar– Land out of cultivation for 3-4 years.

Chaauth or Chauthaai– One-fourth of the land revenue, originally a Zamindari charge in Gujrat demanded by Shivaji as a war expense.

Charai– A tax on cattle.

Dagh System– A system of branding of horses and animal.

Dam- A copper coin considered as 1/40* the silver rupee for the official purposes.

Dastur-al-amal- Rule book

Dhimmi-  A non-Muslim client or subject

Darul Mulk- Capital

Gumashta- An agent or representative

Hamam– A room for the bath of hot and cold water

Hundi- A bill of exchange

Jamabandi– Settlement of the amount of revenue assessed upon an estate or district

Jarib– A measurement, land measurement or survey

Jihat– Extra cesses

Jizya– (a) In the literature of Delhi sultanate, any tax which is not kharaj or land tax

(b) In the Shariat, a personal and yearly tax on non-Muslims.

Kankut– Estimation of land revenue

Karori– A revenue officer.

Khiraj– Land revenue

Mahal- A group of land regarded as a unit for land revenue purposes.

Mansab– A military rank conferred by the Mughal emperor.

Mauza- Revenue term for village

Mokasa- Grant of land for military service, rent-free land.

Nabud– Remission of land revenue on account of natural disasters.

Paibaqi- Land reserved for allotment in jagir

Polaj- Land continuously in cultivation

Sarrafs– Money Chargers, bankers

Saurghal-Rent-free land

Taqavi- Advance of money for sowing or extending cultivation

Upari- Temporary occupant; tenant at will.

Usar- Barren land

Zawabit- Secular laws

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