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Subject: Geography

  • What are fire safety rules, and why are there compliance challenges? | Explained 

    Why in the News?

    Recent fire tragedies at a Rajkot gaming zone and a Delhi children’s hospital that killed 40 people highlight the urgent need for stricter fire safety enforcement.

    According to the latest Accidental Deaths and Suicides in India (ADSI) report

    • It was released by the “National Crimes Records Bureau (NCRB)”
    • In 2022, 7,435 people died in over 7,500 fire accidents. This data shows that heavy casualties from fire accidents persist, with no lessons learned from the 1997 Uphaar Cinema tragedy or the 2004 Kumbakonam fire that killed 90 schoolchildren.

    What are the various laws and guidelines which stipulate rules around fire safety in buildings? 

    • National Building Code (NBC): Published by the Bureau of Indian Standards (BIS) in 1970, last updated in 2016.
      • Part 4 of NBC is about the details of fire safety measures, including construction guidelines, materials, and safety protocols. They are mandatory for states to incorporate NBC recommendations into local buildings.
    • Model Building Bye Laws 2016: It is issued by the Ministry of Housing and Urban Affairs. It guides States/UTs in framing building bylaws with norms for fire protection and safety.
    • State Fire Services Act: Fire services are a state subject, and individual states have their own Fire Services Acts or building bylaws.
    • National Disaster Management Authority (NDMA) Guidelines: Provide fire safety instructions for homes, schools, and hospitals. Include recommendations on maintaining safety spaces, exit mechanisms, dedicated staircases, and evacuation drills.

    Key Points from Fire Safety Regulations by Government:

    • Building Classification: Buildings are classified based on occupancy (e.g., Residential, Institutional, Assembly). Specific measures for high-rise buildings, educational institutes, hotels, etc.
    • Construction Material: Use of non-combustible materials. Internal walls of staircases should have a minimum 120-minute fire rating.
    • Electrical Safety: Flame retardant wiring and cabling. Separate shafts for different voltage wiring, sealed with fire-stop materials.
    • Emergency Power and Signage: Provision of emergency lighting, fire alarm systems, and public address systems. Clear exit signage and escape lighting.
    • Technological Measures: Automatic fire detection and alarm systems.Down-comer pipelines, dry riser pipelines, automatic sprinklers, fire barriers, and fireman’s lifts.

    Challenges in Fire Safety Compliance

    • Lack of Uniform Legislation: Fire safety rules exist in all States, with many drawing from the NBC. However, due to the absence of uniform safety legislation and the NBC being a “recommendatory document,“ its provisions are frequently ignored at the local level.
    • Inadequate Fire Safety Audits: Local bodies fail to conduct regular fire safety checks, leading to non-compliance.
    • Staff Shortages: Insufficient staffing in fire departments exacerbates enforcement issues.
    • Community Awareness and Preparedness: Need for better community awareness and training on fire safety protocols and emergency response.

    Judicial responses to negligence over Public Safety

    • Apex Court: The Judiciary has frequently pulled up state authorities for failure to enforce fire safety regulations. It highlighted the laxity in compliance and the need for stringent enforcement.
    • Legal Actions: Cases like the Rajkot gaming zone fire reveal the consequences of not adhering to fire safety norms. Courts have mandated regular fire safety audits and strict adherence to NBC guidelines.
    • The National Institute of Disaster Management (NIDM) emphasized the need for building community resilience and compliance with safety norms.
    • The report on “Fires in India: Learning Lessons for Urban Safety” underscored the failure of authorities to learn from past tragedies and enforce fire safety measures.

    Way forward:

    • Building some National Standards: The National Building Code (NBC) needs to be converted from a recommendatory document to a mandatory standard across all states.
    • Regular Inspections: Mandate regular and frequent fire safety audits by local authorities.
    • Transparent Assessment: Allow third-party certified agencies to conduct independent fire safety audits to ensure unbiased assessments.

    Mains PYQ:

    Q Discuss the recent measures initiated in disaster management by the Government of India departing from the earlier reactive approach. (UPSC IAS/2020)

  • In news: Campi Flegrei Super Volcano 

    Why in the News?

    A 4.4 magnitude earthquake struck Italy’s Campi Flegrei super volcano, with Pozzuoli as the epicentre. Felt as far as Naples, it’s the strongest tremor in 40 years

    Bradyseism Concerns near Campi Flegrei:

    • Campi Flegrei is prone to bradyseism, where ground elevation changes due to subsurface pressure.
    • The area, located 50 kilometres from Mt. Vesuvius, is undergoing a new cycle of bradyseism, according to volcanologists.
    • Over 500,000 people reside in the red zone adjacent to Campi Flegrei, prompting the Italian Civil Protection Agency to update evacuation plans.

    About Campi Flegrei Volcano

    • Campi Flegrei, also known as the Phlegraean Fields, is a large volcanic area located in the western suburbs of Naples, Italy.
    • It is one of the most active volcanic systems in the world and has been active for at least 50,000 years.

    Its Volcanic System:

    • Location: Campi Flegrei is situated within the Campanian volcanic arc in southern Italy, extending from the city of Naples to the Gulf of Pozzuoli.
    • Geological Formation: The volcanic system of Campi Flegrei is characterized by a large caldera, which is a collapsed volcanic crater, surrounded by numerous volcanic vents, craters, and lava domes. The caldera has a diameter of about 13 kilometers (8 miles).
    • Volcanic Activity: Campi Flegrei is considered a supervolcano due to its size and potential for large eruptions. It has experienced numerous periods of volcanic activity throughout its history, including explosive eruptions, lava flows, and phreatic (steam-driven) eruptions.
    • Terrain Features: The landscape of Campi Flegrei is characterized by volcanic features such as craters, fumaroles (steam vents), mud pots, and hot springs.

    PYQ:

    [2021] Mention the global occurrence of volcanic eruptions in ‘2021’ and their impact on regional environment.

    [2018] Consider the following statements:

    1. The Barren Island volcano is an active volcano located in the Indian Territory.
    2. Barren Island lies about 140 km east of Great Nicobar.
    3. The last time the Barren Island volcano erupted was in 1991 and it has remained inactive since then.

    Which of the statements given above is/are correct?

    (a) 1 only

    (b) 2 and 3

    (c) 3 only

    (d) 1 and 3

  • Cyclone Remal to make landfall

    Why in the News?

    • Cyclone Remal is forecasted to make landfall between Sagar Island in West Bengal and Bangladesh’s Khepupara on Sunday midnight.
    • The name ‘Remal’ originates from Oman and means ‘sand’ in Arabic.

    What are Cyclones?

    • Cyclones are wind systems rotating inwardly towards an area of low atmospheric pressure. They are categorised into Tropical (Temperature-induced) and Temperate (extra-tropical) cyclones(airmass-induced).
    • Formation Conditions: Tropical cyclones originate in warm regions, requiring conditions such as
    1. Warm sea surface (> 27°C),
    2. Coriolis Force,
    3. Pre-existing low-pressure systems,
    4. Small vertical wind speed differences, and
    5. Upper air divergence.

    Characteristics of Tropical Cyclones:

    • They form over warm water bodies due to energy derived from the condensation of warm water within cumulonimbus clouds.
    • Wind rotation is influenced by the Coriolis force, resulting in anti-clockwise rotation in the northern hemisphere and clockwise in the southern hemisphere.

    Regional Movement of Cyclones:

    • In the northern hemisphere, cyclones initially move westward under earth rotation and the Easterlies.
    • As they progress towards higher latitudes, the Coriolis force deflects them rightward, towards north and later east.
    • By 30° latitude, the diminished warmth halts cyclone activity.

    Naming of Cyclones: 

    • Responsibility of RSMCs and TCWCs: The naming of cyclones that form in every ocean basin across the world is carried out by the Regional Specialised Meteorological Centres (RSMCs) and Tropical Cyclone Warning Centres (TCWCs).
    • Procedure in the North Indian Ocean: For north Indian Ocean including Bay of Bengal and Arabian Sea, the RSMC, New Delhi assigns the name to tropical cyclones following a standard procedure.
    • Agreement by WMO/ESCAP Panel: The WMO/ESCAP Panel on Tropical Cyclones in 2000 agreed in principle to assign names to the tropical cyclones in the Bay of Bengal and Arabian Sea.
    • Selection Process: Each country would sent their suggestions, based on which the Panel would finalise a list.
    • Retirement of Names: Generally, names of some storms that cause widespread damage and deaths are usually retired and are not brought back or reused later, at least for 10 years. These names are then replaced with new names.
    • Unique Policy for North Indian Ocean: Unlike in other regions, the names of tropical cyclones over the north Indian Ocean once used, will cease to be used again.

    Destruction Caused by Cyclones:

    • Strong Winds/Squall: Cyclones cause infrastructure damage through high-speed winds.
    • Torrential Rains and Inland Flooding: Heavy rainfall leads to floods, soil erosion, and embankment weakening.
    • Storm Surge: Abnormal sea level rise inundates coastal regions, causing floods, erosion, and destruction.

    PYQ:

    [2015] In the South Atlantic and South Eastern Pacific regions in tropical latitudes, cyclone does not originate. What is the main reason behind this?

    (a) Sea Surface temperature are low

    (b) Inter Tropical Convergence Zone seldom occurs

    (c) Coriolis force is too weak

    (d) Absence of land in those regions

  • Speculoos-3b: A New Earth-Sized Exoplanet Discovered

    Why in the News?

    • Astronomers have identified a new Earth-sized exoplanet, named Speculoos-3b, orbiting an ultracool red dwarf star.

    Back2Basics: Red Dwarf Star

    • A red dwarf is the most common type of star in the Milky Way galaxy.
    • However, due to their low luminosity, individual red dwarfs cannot be easily observed.
    • Proxima Centauri, the star nearest to the Sun, is a red dwarf, as are fifty of the sixty nearest stars.
    • According to some estimates, red dwarfs make up three-quarters of the fusing stars in the Milky Way.

    About Speculoos-3b

    • Speculoos-3b is an Earth-sized exoplanet recently discovered orbiting an ultracool dwarf star.
    • It was discovered by a team of astronomers led by Michael Gillon from the University of Liege in Belgium.
    • It is located approximately 55 light-years away from Earth.
    • Due to its short orbital period, Speculoos-3b receives almost ten times more energy per second than Earth does from the Sun.

    SPECULOOS Project 

    • Project Overview: The discovery was made under the SPECULOOS project, aimed at exploring exoplanets around ultra-cool dwarf stars.
    • The SPECULOOS Southern Observatory is a project carried out by the University of Liège (Belgium) and the Cavendish Laboratory in Cambridge (United Kingdom)

    Astrophysical Significance of the Discovery

    • Prevalence of Ultracool Dwarfs: Ultracool dwarf stars, like the host of Speculoos-3b, constitute about 70% of all stars in our galaxy and are known for their longevity, surviving up to 100 billion years.
    • Importance for Life’s Potential: The extended lifespan of these stars provides a stable environment that could potentially support the development of life on orbiting planets.

    PYQ:

    [2015] The term ‘Goldilocks Zone’ is often seen in the news in the context of:

    (a) the limits of habitable zone above the surface of the Earth

    (b) regions inside the Earth where shale gas is available

    (c) search for the Earth-like planets in outer space

    (d) search for meteorites containing precious metals

  • In News: Mahi River 

    Why in the News?

    Incidences of people drowning down into the Mahi River have become more frequent.

    About Mahi River

    • The Mahi River originates in the Vindhya Range of Madhya Pradesh (hot semi-arid and watershed region), near Dhar.
    • It flows northward through Madhya Pradesh before turning westward upon entering Rajasthan. It then moves southwest, passing through Gujarat, and eventually empties into the Arabian Sea.
    • The river stretches for about 580 kilometers.
      • Soil Type: The Mahi River Basin consists of Deep Black soil (southern region) and Alluvial soil (northern region).
      • Major Tributaries: the Som, the Anas, the Panam, and the Goma.
      • Major Dams: Kadana Dam and the Mahi Bajaj Sagar (Banswara) Dam are significant hydroelectric and irrigation projects on the Mahi River.
      • Biodiversity: Supports diverse flora and fauna, including endangered species like the Indian Skimmer and Gharial.

    Key Features:

    • It is surrounded by the Aravalli Hills to the north and northwest, the Malwa Plateau to the east, the Vindhyas to the south, and the Gulf of Khambhat to the west.
    • One of the most notable features of the Mahi River is its crossing of the Tropic of Cancer twice; once in Madhya Pradesh and again near the Gujarat-Rajasthan border.

    PYQ:

    [2017] With reference to river Teesta, consider the following statements:

    1. The source of river Teesta is the same as that of Brahmaputra but it flows through Sikkim.

    2. River Rangeet originates in Sikkim and it is a tributary of river Teesta.

    3. River Teesta falls into Bay of Bengal at the border of India and Bangladesh.

    Which of the statements given above is/are correct?

    (a) 1 and 3 only

    (b) 2 only

    (c) 2 and 3 only

    (d) 1, 2 and 3

    With inputs from: https://indiawris.gov.in/downloads/Mahi%20Basin.pdf

  • Aurora Borealis: What are Northern and Southern lights? Why do they occur?

    Why in the news?

    • In a rare event, the night sky over Hanle village in Ladakh was illuminated by the northern lights or aurora borealis.
      • Concurrently, the southern lights, or aurora australis, were observed in New Zealand and Australia.

    What are Auroras?

    • Auroras are natural light displays that appear as bright, swirling curtains in the night sky.
    • They are typically seen near the Poles but can occasionally be observed at lower latitudes.
    • These lights can display a range of colors, including blue, red, yellow, green, and orange, due to the interaction of solar particles with different gases in the Earth’s atmosphere.
    • The phenomenon is known as:
    1. Aurora borealis in Northern Hemisphere and
    2. Aurora australis in Southern Hemisphere

    What causes Auroras?

    • Interaction with Earth’s Magnetic Field: As the solar wind approaches Earth, it interacts with the planet’s magnetic field, causing some charged particles to enter the atmosphere near the poles.
    • Interaction with Gases: These particles interact with gases in the upper atmosphere, producing colourful flashes of light. Collision with oxygen produces green light, while interaction with nitrogen results in shades of blue and purple.

    Reasons for Aurora in Ladakh:

    • Intense Solar Activity: Auroras can extend to lower latitudes during periods of intense solar activity, such as solar flares and coronal mass ejections (CMEs).
      • The CMEs are from the AR13664 region of the sun that has produced several high-energy solar flares
    • Localized magnetic anomalies: Variations in Earth’s magnetic field could potentially influence the occurrence of auroras in specific areas, including regions at lower latitudes.

    Impact on Tech Infrastructure 

    • Auroras can pose challenges to space-dependent technologies and operations.
    • Disruptions in Global Positioning Systems (GPS), radio communications, flight operations, power grids, and space exploration endeavors may occur during such events.

    PYQ:

    [2022] If a major solar storm (solar flare) reaches the Earth, which of the following are the possible effects on the Earth?

    1. GPS and navigation systems could fail.
    2. Tsunamis could occur at equatorial regions.
    3. Power grids could be damaged.
    4. Intense auroras could occur over much of the Earth.
    5. Forest fires could take place over much of the planet.
    6. Orbits of the satellites could be disturbed.
    7. Shortwave radio communication of the aircraft flying over Polar Regions could be interrupted.

    Select the correct answer using the code given below:

    (a) 1, 2, 4 and 5 only
    (b) 2, 3, 5, 6 and 7 only
    (c) 1, 3, 4, 6 and 7 only
    (d) 1, 2, 3, 4, 5, 6 and 7

     

  • Positive Indian Ocean Dipole (IOD) to aid Monsoon this year

    Why in the News?

    Australian weather agencies predict the possible return of a positive Indian Ocean Dipole (IOD) in the latter half of 2024.

    What is the Indian Ocean Dipole (IOD)?

    • The IOD is also known as the Indian Nino. It is characterized by the differential heating of ocean waters in the eastern and western parts of the basin.
    • Similar to the El Nino Southern Oscillation (ENSO) in the Pacific, the IOD involves phases of ocean temperatures and atmospheric conditions that affect weather patterns across the region and beyond.
    • There are two main phases of the IOD:
      • Positive Phase: In this phase, the western Indian Ocean becomes warmer than average, and the eastern part cooler than average. This results in greater convection and rainfall over the western Indian Ocean and adjacent land areas like East Africa, while reducing rainfall over the eastern Indian Ocean and places like Indonesia and Australia.
      • Negative Phase: The opposite conditions prevail during this phase, with cooler waters in the western Indian Ocean and warmer waters in the east. This leads to increased rainfall in the eastern Indian Ocean regions and drier conditions in the western part and East Africa.

    Back2Basics: El Nino-Southern Oscillation (ENSO)

    • El Nino and La Nina are two opposite phases of the El Nino-Southern Oscillation (ENSO) cycle.
    • ENSO is a naturally occurring phenomenon that involves the interaction between the ocean and atmosphere in the equatorial Pacific.

    Here is a detailed comparison of El Nino and La Nina

    El Nino La Nina
    Definition Warmer-than-normal sea surface temperatures Cooler-than-normal sea surface temperatures
    Frequency Every two to seven years Every two to seven years
    Duration Several months to a year or more Several months to a year or more
    Impact on winds Weakens trade winds, leading to changes in patterns Strengthens trade winds, leading to changes in patterns
    Impact on rains Reduces rainfall and can cause droughts Increases rainfall and can cause flooding
    Impact on temp. Warmer-than-average temperatures Colder-than-average temperatures
    Global effects Droughts in Asia and Africa, floods in Americas Floods in Asia and Africa, droughts in South America

     

    Impact on the Indian Monsoon:

    The Indian Ocean Dipole has significant impacts on the Indian monsoon system:

    1. Positive IOD often coincides with a stronger Southwest Monsoon, bringing more rainfall to India. This is due to the shift in warm water and accompanying convection towards India, which enhances the monsoon rainfall.
    2. Negative IOD can weaken the Southwest Monsoon, resulting in less rainfall and potential drought conditions in India. The shift of warm water away from India reduces the necessary heat and moisture that drive the monsoon rains.

    PYQ:

    [2017] With reference to ‘Indian Ocean Dipole (IOD)’ sometimes mentioned in the news while forecasting Indian monsoon, which of the following statements is/are correct?

    1. IOD phenomenon is characterised by a difference in sea surface temperature between tropical Western Indian Ocean and tropical Eastern Pacific Ocean.

    2. An IOD phenomenon can influence an El Nino’s impact on the monsoon.

    Select the correct answer using the code given below:

    (a) 1 only

    (b) 2 only

    (c) Both 1 and 2

    (d) Neither 1 nor 2

  • Eta Aquariid Meteor Shower and how it can be spotted

    Why in the news?

    • The Eta Aquariid meteor shower, an annual event, will reach its peak on May 5 and 6.
    • This meteor shower is a result of Earth intersecting with the debris trail left by Halley’s Comet during its orbit.

    Halley’s Comet

    • Halley’s Comet is a short-period comet visible from Earth every 75–79 years.
    • It was last seen in Earth’s skies in 1986 and was met in space by an international fleet of spacecraft. It will return in 2061 on its regular journey around the Sun.

    What are Meteoric Showers?

    • Meteors, fragments of dust, rock and ice, are expelled from comets during their celestial orbits around the sun.
    • The Earth’s atmosphere heats these space rocks as they descend, leaving luminous streaks of gas in their way.
    • NASA’s records confirms existence of over 30 meteor showers annually.

    Origin of Meteor Showers:

    • Meteor showers originate from comets, remnants of the solar system’s formation composed of dust, rock, and ice.
    • Comets orbit the Sun in highly elliptical paths, and as they approach, they heat up, releasing gases and dust to form a glowing head and a tail stretching millions of miles.
    • When Earth traverses through the debris left behind by comets along their orbital plane, we witness meteor showers.

    About Eta Aquariids

    • Known for their rapid speed, Eta Aquariid meteors produce long, glowing tails lasting several minutes.
    • Observers in the Southern Hemisphere can witness approximately 30 to 40 meteors per hour during the peak, while those in the Northern Hemisphere may see around 10 meteors per hour.
    • They seem to originate from the Aquarius constellation, hence the name ‘Eta Aquariid.’

    PYQ:

    [2014] What is a coma, in the content of astronomy?

    (a) Bright half of material on the comet

    (b) Long tail of dust

    (c) Two asteroids orbiting each other

    (d) Two planets orbiting each other

  • Mapping: Garo Hills

    Why in the news?

    • Geological Survey of India (GSI) explorers have made a breakthrough, uncovering ancient fossils in Tolegre, South Garo Hills of Meghalaya.
    • It is speculated that the fossils could be linked to the genera Rhodocetus or Amulocetus (now extinct), considered ancestors of modern whales.

    About Garo Hills

    • The Garo Hills, located in Meghalaya, are part of the Garo-Khasi range, one of the hill ranges in the northeastern region of India.
    • They are situated in the western part of Meghalaya, bordering Bangladesh to the south and west.
    • The terrain of the Garo Hills is rugged and hilly, characterized by dense forests, steep slopes, and deep valleys.
    • The Nokrek is highest Peak, which stands at approximately 1,415 meters (4,642 feet) above sea level.
    • The climate in the Garo Hills is typically humid subtropical, with heavy rainfall during the monsoon season, which usually lasts from June to September.
    • Numerous rivers and streams, including the Brahmaputra, Someshwari, and Jinjiram rivers crisscross this region.
    • The region is also known for its picturesque waterfalls, such as the Pelga Falls, located near Tura, the largest town in the Garo Hills.
    • The Nokrek National Park, located within, is recognized as a UNESCO Biosphere Reserve and is home to various endangered species, including the Asian elephant and the red panda.
    • The Garo Hills are inhabited predominantly by the Garo tribe, one of the major ethnic groups in Meghalaya.

     

    PYQ:

    [2013] Consider the following pairs:

    1. Nokrek Bio-Sphere Reserve : Garo Hills

    2. Logtak (Loktak) Lake : Barail Range

    3. Namdapha National Park: Daphla Hills

    Which of the above pairs is/are correctly matched?

    (a) 1 only

    (b) 2 and 3 only

    (c) 1, 2 and 3

    (d) None

  • Mapping: Hopen Island in the Svalbard Archipelago

    Why in the news?

    Researchers disclosed that one of Norway’s Hopen Island in the Svalbard Archipelago witnessed its first walrus death due to Bird Flu (H5N1).

    About Hopen Island in the Svalbard Archipelago

    • Hopen Island is situated in the southern part of the Svalbard Archipelago, between the Barents Sea and the Greenland Sea.
    • The island covers an area of about 47 square km, making it one of the smaller islands in the Svalbard group.
    • The landscape mainly consists of low-lying tundra, rocky outcrops, and coastal cliffs.
    • Like the rest of Svalbard, Hopen Island experiences a harsh Arctic climate. Winters are long, dark, and extremely cold, while summers are short and cool.
    • It serves as an important breeding ground for seabirds such as guillemots, puffins, and kittiwakes. Polar bears are also occasionally spotted on the island, along with walruses, seals, and Arctic foxes.
    • It is uninhabited and largely inaccessible to humans due to its remote location and extreme weather conditions.
    • Historically, Hopen Island has been of strategic importance due to its location between the Barents Sea and the Greenland Sea.

    H5N1 Bird Flu: Details

    • H5N1 originated from a virus outbreak on a goose farm in China in 1996 and has since evolved into a highly pathogenic strain.
    • The virus quickly spread from Europe to Africa, Asia, North America, and South America, and most recently, it reached mainland Antarctica.
    • H5N1 is a subtype of the influenza A virus that causes severe respiratory disease in birds, known as avian influenza or “bird flu”.
    • Influenza A viruses are classified by subtypes based on the properties of their surface proteins, with H5N1 being one subtype.

    How widespread is it?

    • The virus has affected birds in over 80 countries, resulting in mass culling of poultry and wild birds.
    • Furthermore, it has now begun infecting mammals, including seals, sea lions, and marine mammals.
    • While humans rarely contract bird flu, those at risk are typically individuals who have extensive contact with infected birds at poultry farms.
    • Bird flu first broke out in Maharashtra in 2006.
    • The H5N1 virus led to the culling of millions of poultry so as to contain the virus. But it has resurfaced from time to time.

     

    PYQ:

    [2014] Which one of the following pairs of islands is separated from each other by the ‘Ten Degree Channel’?

    (a) Andaman and Nicobar

    (b) Nicobar and Sumatra

    (c) Maldives and Lakshadweep

    (d) Sumatra and Java