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  • Artform in news: Shumang Leela

    shumang leela

    This newscard is an excerpt from the original article published in TH.

    Shumang Leela

    • Shumang Leela is a unique traditional form of theatre in Manipur.
    • The tradition is believed to be descended from Lai Haraoba, a ritual of the Meitei community of Manipur.

    Types of this dance

    Shumang Leela is of two types:

    1. Nupa Shumang Leela: It performed only by men. Here the roles of women are all played by men, called Nupi Shabis.
    2. Nupi Shumang Leela: It performed only by women and the roles of men are played by women.

    Performance details

    • The plays serve as a medium to spread awareness among people of social, political and economic issues. Shumang Leelas may also discuss moral values, unity and integrity.
    • This theatre form has for long been trying to strengthen the bond of brotherhood and friendship among various communities in the State.

    Significance of the art

    • In a society marked by heteronormativity, the gender-bending nature of Shumang Leela makes it a unique art form that is fraught with complexity.
    • The men who take up female roles or vice versa are highly appreciated and laughed at.
    • The traditional theatre form has preserved its original form, and its aim to inform and entertain has remained unchanged.

     

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  • Census: A prerequisite for economic development

    Census

    Context

    • India aspires to be a $10 trillion economy by 2035. To achieve this, conducting population Census, due in 2021 but postponed indefinitely because of Covid, is necessary. Such data is essential for planning at the village or block level to usher in economic and social development, ensure better governance, and increase the transparency of public schemes and programmes.

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    What is a census?

    • It is nothing but a process of collecting, compiling, analysing, evaluating, publishing and disseminating statistical data regarding the population.
    • It covers demographic, social and economic data and is provided as of a particular date.

    Census

    What is the purpose?

    • To collect the information for planning and formulation policies for Central and the State Governments.
    • The census tells us who we are and where we are going as a nation.
    • It helps the government decide how to distribute funds and assistance to states and localities.
    • The census data is widely used by National and International Agencies, scholars, business people, industrialists, and many more.

    Why conducting a Census has become a prerequisite for economic development?

    • Lack of complete civil registration system: Since many states (and districts) lack a complete civil registration system with a full count of birth and death data, demographers face enormous challenges in providing population counts at the district level. In several instances, estimates tend to be far off the mark, especially for newly formed districts and states.
    • Changing pattern of migration: migration data collected in the Census has great implications for economic activities and social harmony. As India progresses economically, the pattern of migration has been changing in unprecedented ways. The migration pattern in India in the present decade is very different from what the data in Census 2001 and 2011 suggest. Hence, in the absence of updated data, it is difficult to draw conclusions about migration in India.
    • Other surveys does not provide comprehensive data: The Census counts everyone across regions, classes, creeds, religions, languages, castes, marital status, differently-abled populations, occupation patterns etc. Most national-level surveys such as NFHS and NSSO do not have representative data at the population subgroup level, unlike the former. The existence of numerous faiths and languages as well as the expansion or extinction of such communities will be known only via population Census.

    Census

    In the absence of it how demographers collect data?

    • Estimates using past census information: In the absence of updated data, demographers estimate the annual population count at the district level using past Census information for the intercensal or postcensal period. Say, to estimate the population of a district in India in the year 2015, they use the district-level population growth rate between the 2001 and 2011 Census.
    • Such estimates are fair for maximum of 10 years: Such demographic exercises give reasonably fair estimates when the year of population estimation is within the range of a maximum of 10 years. Beyond this period, estimations can be erroneous, particularly at the district level due to dynamic patterns of population components, among them fertility, mortality and migration.
    • Assumptions based model in faster demographic transition: Many districts of India are experiencing a faster demographic transition with varying fertility and mortality rates. So, using the growth rate of 2001-2011 for the period after 2021 becomes more of an assumption-based model than a model that reflects empirical reality. Covid-19 further makes the situation complex as it impacts the fertility and mortality situation in the country.

    Demand for caste census in India

    • India’s population has since increased three-fold to 1.21 billion in 2011.
    • Experts believe the economic status of the dominant OBC castes have improved in the past 80 years and certain castes have not benefited as much.
    • So, the new caste census is required to measure the economic and social well-being of all castes.

    Census

    History and a Way ahead

    • India has a long history of conducting Census without interruption from 1881 with the rare exception of Assam in 1981 and Jammu Kashmir in 1991 due to socio-political unrest and secessionist movements.
    • Conducting it regular at the national and sub-national levels has been a matter of pride for India.
    • It has to be continued until India achieves a fool-proof civil registration system and a dynamic National Population Register.

    Conclusion

    • Conducting the population Census is a mammoth task, of course. Full involvement of the government system is necessary to organise it. But the it is necessary since it forms the basis of all the plans and programmes that the government wants to implement. Postponing the it has immediate and long-term negative consequences for India. The government and other stakeholders should take urgent steps to conduct the Census as early as possible.

    Mains question

    Q. What is census? Why conducting a Census has become a prerequisite for economic development and also discuss the impact of delayed census.

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  • How do ruminants contribute to Methane Pollution?

    methane

    Bill Gates has invested in a climate technology start-up that aims to curtail the methane emissions of cow burps.

    What is the news?

    • The startup Rumin8 is developing a variety of dietary supplements to feed to cows in a bid to reduce the amount of methane they emit into the atmosphere.
    • The supplement includes red seaweed, which is believed to drastically cut methane output in cows.

    What is Methane?

    • Methane is a greenhouse gas, which is also a component of natural gas.
    • There are various sources of methane including human and natural sources.
    • The anthropogenic sources are responsible for 60 per cent of global methane emissions.
    • It includes landfills, oil and natural gas systems, agricultural activities, coal mining, wastewater treatment, and certain industrial processes.
    • The oil and gas sectors are among the largest contributors to human sources of methane.
    • These emissions come primarily from the burning of fossil fuels, decomposition in landfills and the agriculture sector.

    How do cows and other animals produce methane?

    • Ruminant animals such as cows, sheep, goats, and buffaloes release this methane mainly through burping.
    • They have a special type of digestive system that allows them to break down and digest food that non-ruminant species would be unable to digest.
    • Stomachs of ruminant animals have four compartments, one of which, the rumen, helps them to store partially digested food and let it ferment.
    • This partially digested and fermented food is regurgitated by the animals who chew through it again and finish the digestive process.
    • However, as grass and other vegetation ferments in the rumen, it generates methane, a potent greenhouse gas.

    How much do these ruminants contribute to emissions?

    • Given the very large numbers of cattle and sheep on farms in dairy-producing countries, these emissions add up to a significant volume.
    • It is estimated that the ruminant digestive system is responsible for 27 per cent of all methane emissions from human activity.

    Why is methane such a big problem?

    • Methane is one of the main drivers of climate change, responsible for 30 per cent of the warming since preindustrial times, second only to carbon dioxide.
    • Over a 20-year period, methane is 80 times more potent at warming than carbon dioxide, according to a report by the UNEP.
    • It’s also the primary contributor to the formation of ground-level ozone, a colourless and highly irritating gas that forms just above the Earth’s surface.
    • According to a 2022 report, exposure to ground-level ozone could be contributing to 1 million premature deaths every year.
    • Several studies have shown that in recent years, the amount of methane in the atmosphere has dramatically shot up.

    Mitigating methane emissions

    • Scientists have been working on to make these animals more sustainable and less gassy.
    • A 2021 study, published in the journal PLUS ONE, found that adding seaweed to cow feed can reduce methane formation in their guts by more than 80 per cent.
    • Apart from this, researchers are also trying to find gene-modifying techniques to curtail methane emissions in these animals.
    • Last year, scientists in New Zealand announced they had started the world’s first genetic programme to address the challenge of climate change by breeding sheep that emit lower amounts of methane.

    Global collaboration against methane pollution

    Ans. Global Methane Initiative (GMI)

    • GMI is a voluntary Government and an informal international partnership having members from 45 countries including the United States and Canada.
    • India last year co-chaired along with Canada the GMI leadership meet held virtually.
    • The forum has been created to achieve global reduction in anthropogenic methane emission through partnership among developed and developing countries having economies in transition.
    • The forum was created in 2004 and India is one of the members since its inception and has taken up Vice-Chairmanship for the first time in the Steering Leadership along with USA.

    Back2Basics: CO2 Equivalents

    • Each greenhouse gas (GHG) has a different global warming potential (GWP) and persists for a different length of time in the atmosphere.
    • The three main greenhouse gases (along with water vapour) and their 100-year global warming potential (GWP) compared to carbon dioxide are:

    1 x – carbon dioxide (CO2)

    25 x – methane (CH4) – I.e. Releasing 1 kg of CH4into the atmosphere is about equivalent to releasing 25 kg of CO2

    298 x – nitrous oxide (N2O)

    • Water vapour is not considered to be a cause of man-made global warming because it does not persist in the atmosphere for more than a few days.
    • There are other greenhouse gases which have far greater global warming potential (GWP) but are much less prevalent. These are sulphur hexafluoride (SF6), hydrofluorocarbons (HFCs), and perfluorocarbons (PFCs).
    • There are a wide variety of uses for SF6, HFCs, and PFCs but they have been most commonly used as refrigerants and for fire suppression.
    • Many of these compounds also have a depleting effect on ozone in the upper atmosphere.

     

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  • Choudhary Rehmat Ali: Man behind the name ‘Pakistan’

    pakistan

    In this article, we take you to the history of Pakistan (which is on the brink of its demise) and the facts behind its naming.

    Jinnah and Pakistan

    • Muhammad Ali Jinnah is remembered as the founder of Pakistan, its “Qaid e Azam”, or the “Great Leader.”
    • He led a movement that transformed a weak idea of a sovereign Islamic state in British India’s north western provinces into reality.
    • But he was not the first to come up with the idea of Pakistan, nor was he its original champion.

    Rehmat Ali: Coining the term ‘Pakistan’

    • Choudhary Rehmat Ali can be credited with coining the “term” Pakistan, styling himself as the “Founder of the Pakistan National Movement”.
    • On January 28, 1933, he released a pamphlet titled “Now or Never: Are we to live or perish forever”.
    • In it he made a vehement “appeal on behalf of the thirty million Muslims of PAKISTAN, who live in the five Northern Units of India… for the recognition of their national status.
    • He highlighted the distinctiveness with the other inhabitants of India citing religious, social and historical grounds.
    • According to many historians, this can be seen as the genesis of the very idea of Pakistan; an idea which would become mainstream by the 1940s.

    Ali’s appeal

    • Rehmat Ali’s appeal was as much a critique of Nationalism wave.
    • He distributed pro-Pakistan pamphlets in the Third Round Table Conference (1932).
    • Fearing that the Muslim minority will be subsumed by the Hindu population under the proposed constitution, he advocated for a separate, sovereign entity.
    • For him, British India was not the home of one single nation but rather the designation of a State created by the British for the first time in history.

    His idea of Pakistan

    • This nation that Rehmat Ali called his own was Pakistan, including “five Northern Provinces of India” – Punjab (P), North- West Frontier Province or the Afghan Province (A), Kashmir (K), Sindh(S) and Balochistan (tan).
    • He would call its Pakistan.
    • He argued that this region, with its “distinct marks of nationality,” would be “reduced to a minority of one in ten,” in a united Indian federation.

    Exposition of the “Two Nation Theory”

    • Rehmat Ali was not a politician. In 1947, Ali’s dream became a reality.
    • Nor did he stay in the subcontinent for much of the 1930s and 1940s when the struggle for Pakistan was taking shape.
    • His contribution to Pakistan are solely limited to his writings and ideas.
    • Unlike Iqbal, more popularly known as the philosopher behind Pakistan’s creation, Ali’s work remained restricted to a far smaller audience.
    • But it was important, arguably essential, for Pakistan’s creation.
    • In his work, we see the most radical exposition of the “Two Nation Theory”, later made famous by Jinnah and the Muslim League.

    How Jinnah overtook Rehmat Ali?

    • Things began to change from 1937 onwards, after Jinnah fell out with the Congress.
    • With the leader’s rhetoric turning increasingly separationist, Rahmat Ali’s articulation of Pakistan found its way into mainstream discourse.
    • In 1940, at the Muslim League’s Lahore session, the famous Lahore Resolution was passed.
    • It advocated that the geographical contiguous units in the Muslim-majority areas in India’s “North-Western and Eastern Zones of India, be grouped to constitute Independent States.
    • While this resolution did not mention “Pakistan,” Jinnah’s ideas echoed Rahmat Ali’s.
    • Somewhere between 1940 and 1943, the term “Pakistan” started being used by Jinnah and other Muslim League leaders in their speeches and correspondence.

     

    Try this PYQ:

    Q.Mahatma Gandhi undertook fast unto death in 1932, mainly because:

    (a) Round Table Conference failed to satisfy Indian political aspirations

    (b) Congress and Muslim League had differences of opinion

    (c) Ramsay Macdonald announced the Communal Award

    (d) None of the statements (a), (b) and (c) given above is correct in this context

     

    [wpdiscuz-feedback id=”zy4hsvahii” question=”Please leave a feedback on this” opened=”1″]Post your answers here.[/wpdiscuz-feedback]

     

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  • Mughal Gardens will now be called as Amrit Udyan

    mughal

    The Rashtrapati Bhavan gardens — popularly known as the Mughal Gardens was renamed as Amrit Udyan.

    The Amrit Udyan

    • Edwin Lutyens had finalized the designs of the Mughal Gardens in 1917, but it was only during the year 1928-1929 that planting was done.
    • It is spread across 15 acres and it incorporates both Mughal and English landscaping styles.
    • The main garden has two channels intersecting at right angles dividing the garden into a grid of squares- a Charbagh (a four-cornered garden)- a typical characteristic of Mughal landscaping.
    • There are six lotus-shaped fountains at the crossings of these channels rising to a height of 12 feet.
    • The gardens house nearly 2500 varieties of Dahlias and 120 varieties of roses.

    Why was it earlier named as Mughal Gardens?

    • The garden is designed in Persian style of landscaping or what we call as ‘‘Mughal Gardens”.
    • In fact, Edward Lutyens who designed the Viceroy’s House, what we call today as Rashtrapati Bhavan had deliberately used Mughal architectural details as part of the British appeasement plan.
    • We see Chajja (dripstone), the Chattri (domed kiosk), the Jali (pierced screen) and many other Indian architectural features liberally used there.
    • Mughal canals, terraces and flowering shrubs are beautifully blended with European flowerbeds, lawns and private hedges.

    Back2Basics: Mughal Gardening in India- The Charbagh Style

    mughal

    • The Mughals were known to appreciate gardens. In Babur Nama, Babur says that his favourite kind of garden is the Persian charbagh style (literally, four quadrants garden).
    • The charbagh structure was intended to create a representation of an earthly utopia – ‘jannat’ – in which humans co-exist in perfect harmony with all elements of nature.
    • Defined by its rectilinear layouts, divided in four equal sections, these gardens can be found across lands previously ruled by the Mughals.
    • From the gardens surrounding Humanyun’s Tomb in Delhi to the Nishat Bagh in Srinagar, all are built in this style – giving them the moniker of Mughal Gardens.
    • A defining feature of these gardens is the use of waterways, often to demarcate the various quadrants of the garden.
    • Fountains were often built, symbolising the “cycle of life.”

     

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  • Munroe Thuruthu: Kerala’s Sinking Island

    munroe

    A study conducted by the National Centre for Earth Science Studies (NCESS) has revealed anthropogenic interventions as the main reason for the sinking of Munroe Thuruthu Kerala’s, Kerala’s Sinking Island.

    Note: This Island has nothing to do with Thomas Monroe, the erstwhile Governor of Madras Presidency (1820-27).

    Munroe Thuruthu

    • Munroe Thuruthu is an inland island group located at the confluence of Ashtamudi Lake and the Kallada River, in Kollam district of Kerala.
    • The place is named in honour of Resident Colonel John Munro of the former Princely State of Travancore.
    • It is a group of eight small islets comprising a total area of about 13.4 km2.
    • This island is also known as “Sinking Island of Kerala”.

    How was this island inhabited?

    • In 1795 the British established their supremacy in South India and the princely state of Travancore came under their governance.
    • From 1800 onwards, a Resident was appointed by East India Company as administrative head of Travancore.
    • The first Resident was Colonel Colin Macaulay, followed by Colonel John Munro.
    • During his tenure Munro oversaw the land reclamation efforts in the delta where Kallada River joins Ashtamudi Lake and the reclaimed island was named after him as Munroe Island.

    Why in news?

    • The islanders are facing steady land subsidence, tidal flooding and lower agricultural productivity, all of which have triggered a mass exodus from the region.
    • According to the study, almost 39% of the land area of the Munroe Thuruthu has been lost with Peringalam and Cheriyakadavu islands recording a land depletion of around 12% and 47% respectively.
    • The study finds that anthropogenic activities have considerably affected the isostatic conditions and land neutrality of Munroe Thuruthu.

     

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  • Places in news: Jatar Deul Temple

    jatar deul

    Jatar Deul- an ancient terracotta temple in West Bengal’s Sundarbans, which has survived the ravages of time for a millennia, is now facing erosion threat due to increase in air salinity.

    Jatar Deul

    • Jatar Deul also called tower temple (rekha-deul), is located in the numerous rivers criss-crossed by stone-free alluvial and bush landscape of the southern Sundarbans settlements in West Bengal.
    • The temple has a curvilinear tower similar to temple architecture of the Nagara order of Odisha temples.
    • However, this type of brick temple we can see at Nebia Khera, Uttar Pradesh.
    • There is neither a cult nor any other sculptural or inscriptional evidence available also the consecration of the temple is unclear.
    • Some believe it was originally for a Buddhist structure; others see it as a building in honor of the Lord Shiva), whose colorful image, is visible at the interior of the Cella (garbhagriha).

    How old is it?

    • The ASI website states that Jatar Deul is traditionally connected to an inscription, no longer traceable, by one Raja Jayantachandra, purported to have been issued in 975 AD.
    • The discovery of Jatar Deul dates back to the middle of the nineteenth century, when land surveyors stumbled upon a towering brick structure in the midst of the Sundarban.

     

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  • Who was Goswami Tulsidas (1511–1623)?

    tulsidas

    Tulsidas has come into controversy due to some of its verses (Chaupai) mentioned in the Ramcharitmanas.

    Who was Tulsidas?

    • Tulsidas, a Brahmin whose original name was Ram Bola Dubey, is believed to have been born in Rajapur by the Yamuna in today’s Banda district.
    • He composed the Ramcharitmanas on the bank of the Ganga in Varanasi — he is said to have begun writing on Ram Navami day in 1574, and completed the poem over the next few years.
    • Tulsidas lived in the time of Emperor Akbar, and some believe that he was in touch with Abdurrahim Khan-e-Khanan, the son of Akbar’s commander Bairam Khan.

    The Ramcharitmanas

    • The poem was written in the 16th century in the Awadhi dialect that is mainly spoken in the areas that are today’s Lucknow, Prayagraj, and Ayodhya districts.
    • It was written in the Avdhi dialect. The sacred chant ‘Hanuman Chalisa’ is a part of it.
    • It is divided into seven chapters (Kand) that tell the story of Lord Ram from birth to his becoming King of Ayodhya.

    Why is Ramcharitmanas so famous?

    • The Ramcharitmanas is based on the Ramayana, sage Valmiki’s great epic.
    • It is the holiest book of the Indo-Gangetic region, and among the world’s most read holy books — by one estimate, Geeta Press (Gorakhpur) has sold almost 7 crore copies.
    • Across the Hindi heartland, a reference to “Ramayan” often actually means Ramcharitmanas.
    • Tulsidas made the story of Lord Ram popular among the masses because he wrote in the regional dialect that most people understood.

    Tulisdas and political controversies

    • While in the Ramcharitmanas, Lord Ram is maryada purushottam, the epitome of righteousness, his conduct has been criticised by leaders of anti-Brahmin movements like E V Ramasamy Periyar.
    • One of the 22 pledges that Dr B R Ambedkar administered to his followers while embracing Buddhism in October 1956 was: “I shall have no faith in Rama and Krishna, who are believed to be incarnation of God, nor shall I worship them.”
    • Non-upper caste assertion in politics has sometimes been manifested in criticism of the Ramcharitmanas.
    • Critics have used these parts of the poem to accuse Tulsidas of being against the non-upper castes and women, and a flagbearer of the idea of Brahminical superiority.

     

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  • Nari Shakti at the parade

    parade

    Context

    • Watching women lead many of the contingents in the 74th Republic Day parade in New Delhi was encouraging. Their presence was heartening and something for future generations of girls to emulate. While much was made about the induction of women fighter pilots, we need to see how many more have been inducted since then.

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    parade

    Nari Shakti at the parade

    • Nari shakti dominated the parade: Nari Shakti dominated the 74th Republic Day parade as women officers led the marching contingents of the armed forces, CRPF, Akash missile system and Army’s Daredevil team
    • first ever women armed police battalion: In a first, the marching contingent of the CRPF, which has the distinction of raising the first-ever women-armed police battalion in the world, had all women personnel this time.
    • BSF women on the borders: Also, for the first time, BSF women soldiers in colorful uniforms who have been deployed along the desert border with Pakistan joined the parade as part of the camel contingent.

    Light on whether induction of women is mere tokenism?

    • Opening up of opportunities for women: Among the best developments of recent times is the opening of opportunities for girls and young women in Sainik schools and the National Defence Academy.
    • As more women on the field, less logistical issues: Once they don the uniform and there are many more women on the field, then the logistical issues will become less relevant.
    • Promotion for the rank of colonel: The recent news about women being considered in the promotion board for the rank of colonel and subsequently, to command units is tremendously empowering.
    • Military remains an excellent example: The military is an excellent place for women to work in and it is the military’s responsibility to not break that faith.

    Women in commands: Significance

    • Leadership opportunity: Despite working at the grassroots level as junior officers, women officers hitherto did not get an opportunity to prove their leadership skills as they were not eligible to command a unit.
    • Gender parity: Most importantly, it grants women officer’s parity with their male counterparts.
    • Higher ranks: Earlier promotions were staff appointments which are more administrative in nature and not purely command appointments in which an officer commands troops on ground.
    • Benefits after permanent commission: With a longer career in the Army, women officers will be considered for promotions, including to the rank of Colonel and beyond.

    How are women still discriminated?

    • Women are still not eligible in core combat arms such as Infantry, Mechanised Infantry and Armoured Corps.
    • Indian Army is not open to women fighting wars at the borders as foot soldiers.
    • Much of this resistance stems from past instances of male soldiers being taken as prisoners of war and tortured by the enemy.
    • However, the Army has recently decided to open the Corps of Artillery, a combat support arm, to women.

    What more needs to be done?

    • Promoting gender equality at the Parade: It is a great idea to have women’s contingents, with the theme of Nari Shakti, at the parade. However, we must refrain from describing this as an opportunity that has been given to them.
    • Challenges in achieving gender equality in frontline forces: The slow and steady induction of women in ranks below the officer level in a paramilitary force like the Assam Rifles is a far cry from enabling women to be part of the frontline force, as part of the Kumaon Regiment, for example. The regiment’s war cry may be Kalika mata ki jai, but it stops there.

    parade

    Way ahead

    • The military, just like any other institution, is but a reflection of society and, like the other institutions, it is also subject to reform and change for the advancement of society as a whole.
    • We must push for this alongside cheering for Captain Shikha Sharma, the first woman in the Daredevil squad, who so effortlessly displayed her skills at the parade.

    Conclusion

    • Republic Day parade did well to celebrate Nari Shakti. But the day after R-Day, much more needs to be done on inclusion of women in the force.

    Mains question

    Q. Nari shakti said to be dominated the India’s 74th republic day parade. In this context highlight the Significance Women in commands and discuss the challenges.

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  • Earth’s inner core rotating slower than surface: Study

    earth

    Earth’s inner core, a hot iron ball the size of Pluto, has stopped spinning faster than the planet’s surface and might now be rotating slower than it, research suggested.

    A quick recap of Earth’s Interior

    earth

    Structure of earth’s interior is fundamentally divided into three layers – crust, mantle and core.

    [A] Crust

    • It is the outermost solid part of the earth, normally about 8-40 kms thick.
    • It is brittle in nature.
    • Nearly 1% of the earth’s volume and 0.5% of earth’s mass are made of the crust.
    • The thickness of the crust under the oceanic and continental areas are different. Oceanic crust is thinner (about 5kms) as compared to the continental crust (about 30kms).
    • Major constituent elements of crust are Silica (Si) and Aluminium (Al) and thus, it is often termed as SIAL(Sometimes SIAL is used to refer Lithosphere, which is the region comprising the crust and uppermost solid mantle, also).
    • The mean density of the materials in the crust is 3g/cm3.
    • The discontinuity between the hydrosphere and crustis termed as the Conrad Discontinuity.

     [B] Mantle

    • The portion of the interior beyond the crust is called as the mantle.
    • The discontinuity between the crust and mantleis called as the Mohorovich Discontinuity or Moho discontinuity.
    • The mantle is about 2900kms in thickness.
    • Nearly 84% of the earth’s volume and 67% of the earth’s mass is occupied by the mantle.
    • The major constituent elements of the mantle are Silicon and Magnesium and hence it is also termed as SIMA.
    • The density of the layer is higher than the crust and varies from 3.3 – 5.4g/cm3.
    • The uppermost solid part of the mantle and the entire crust constitute the Lithosphere.
    • The asthenosphere (in between 80-200km) is a highly viscous, mechanically weak and ductile, deforming region of the upper mantle which lies just below the lithosphere.
    • The asthenosphere is the main source of magma and it is the layer over which the lithospheric plates/ continental plates move (plate tectonics).
    • The discontinuity between the upper mantle and the lower mantleis known as Repetti Discontinuity.
    • The portion of the mantle which is just below the lithosphere and asthenosphere, but above the core is called as Mesosphere.

    [C] Core

    • It is the innermost layer surrounding the earth’s centre.
    • The core is separated from the mantle by Guttenberg’s Discontinuity.
    • It is composed mainly of iron (Fe) and nickel (Ni) and hence it is also called as NIFE.
    • It constitutes nearly 15% of earth’s volume and 32.5% of earth’s mass.
    • It is the densest layer of the earth with its density ranges between 9.5-14.5g/cm3.
    • It spins independently because it floats in the liquid metal outer core. One cycle of the swing is about seven decades approximately.
    • It consists of two sub-layers: the inner core and the outer core.
    • The inner core is in solid state and the outer core is in the liquid state (or semi-liquid).
    • The discontinuity between the upper core and the lower core is called as Lehmann Discontinuity.
    • Barysphere is sometimes used to refer the core of the earth or sometimes the whole interior.

    What should one understand about the interior of the earth?

    • It is not possible to know about the earth’s interior by direct observations because of the huge size and the changing nature of its interior composition.
    • It is an almost impossible distance for the humans to reach till the centre of the earth (The earth’s radius is 6,370 km).
    • The rapid increase in temperature below the earth’s surface is mainly responsible for setting a limit to direct observations inside the earth.

    Sources of Information about the interior of the earth

    Direct Sources:

    1. Rocks from mining area
    2. Volcanic eruptions

    Indirect Sources

    1. By analyzing the rate of change of temperature and pressurefrom the surface towards the interior.
    2. Meteors, as they belong to the same type of materials earth is made of.
    3. Gravitation, which is greater near poles and less at the equator.
    4. Gravity anomaly, which is the change in gravity value according to the mass of material, gives us information about the materials in the earth’s interior.
    5. Magnetic sources.
    6. Seismic Waves: the shadow zones of body waves (Primary and secondary waves) give us information about the state of materials in the interior.

    What is the new study about?

    • Exactly how the inner core rotates has been a matter of debate between scientists— and the latest research is expected to prove controversial.
    • A new research has analyzed seismic waves from repeating earthquakes over the last six decades.
    • It shows that- the inner core started rotating slightly faster than the rest of the planet in the early 1970s, the study said.
    • But it had been slowing down before coming in sync with Earth’s rotation around 2009.

    What made the core spin slower?

    • So far there is little to indicate that what the inner core does has many effects on surface dwellers.
    • The researchers said this rotation timeline roughly lines up with changes in what is called the “length of day”— small variations in the exact time it takes Earth to rotate on its axis.
    • But the researchers said they believed there were physical links between all of Earth’s layers, from the inner core to the surface.

     

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