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Subject: Geography

  • Places in news: Kamchatka Peninsula

    An ‘ecological disaster’ of sorts is unfolding on a black volcanic beach of the Kamchatka Peninsula in the Russian Far East, according to a report.

    Note the features of the map and surrounding seas.

    About Kamchatka Peninsula

    • The Kamchatka Peninsula is a 1,250-kilometre-long peninsula in the Russian Far East.
    • The Pacific Ocean and the Sea of Okhotsk make up the peninsula’s eastern and western coastlines, respectively.
    • Immediately offshore along the Pacific coast of the peninsula runs the 10,500-metre-deep Kuril–Kamchatka Trench.
    • The Kamchatka Peninsula, the Commander Islands, and Karaginsky Island constitute the Kamchatka Krai of the Russian Federation.
    • The vast majority of the 322,079 inhabitants are ethnic Russians, although about 13,000 are Koryaks (2014).
    • The Kamchatka peninsula contains the volcanoes of Kamchatka, a UNESCO World Heritage Site.

    Why in news?

    • Then, sea animals begin to die in large numbers, their bodies littering the beach.
    • These included octopuses, seals, sea urchins, stars, crabs and fish.
    • Examination of the seawater by the administration has shown that levels of phenols and oil compounds have spiked.

  • Location in news: English Channel

    Hundreds of migrants have taken advantage of the warm weather and calm seas in the English Channel to reach the UK in a flurry of small boat crossings.

    Try this PYQ:

    Q.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

    English Channel

    • The English Channel is an arm of the Atlantic Ocean that separates southern England from northern France.
    • It links to the southern part of the North Sea by the Strait of Dover at its northeastern end.
    • It is the busiest shipping area in the world.
    • It is about 560 km long and varies in width from 240 km at its widest to 34 km in the Strait of Dover.
    • It is the smallest of the shallow seas around the continental shelf of Europe.

  • What are Medicanes?

    Very recently, a medicane named Ianos made landfall along the coast of Greece and caused heavy rainfall and flooding on the islands of Zakynthos, Kefalonia and Ithaca.

    Try this PYQ:

    In the South Atlantic and South-Eastern Pacific regions in tropical latitudes, cyclone does not originate. What is the reason?

    (a) Sea surface temperatures are low

    (b) Inter-Tropical Convergence Zone seldom occurs

    (c) Coriolis force is too weak

    (d) Absence of land in those regions

    What are Medicanes?

    • Medicanes are extra-tropical hurricanes observed over the Mediterranean Sea.
    • Medicanes occur more in colder waters than tropical cyclones, hurricanes and typhoons.
    • Hence, the cores of these storms are also cold, as compared to the warm cores of tropical cyclones.
    • Warmer cores tend to carry more moisture (hence rainfall), are bigger in size and have swifter winds.
    • The main societal hazard posed by Medicanes is not usually from destructive winds but through life-threatening torrential rains and flash floods.

    Why in news?

    • This year is a mild La Niña, according to the World Meteorological Organization.
    • La Niña is the cooling phase of the El Niño Southern Oscillation (ENSO) cycle in the equatorial Pacific Ocean, as opposed to the warming El Niño phase.
    • It is characterized by the unusual cooling of the central and east-central equatorial Pacific Ocean.
    • A La Niña produces more rain in the central-eastern part, where most of the Mediterranean cyclones develop.

  • Re-scaling the height of Mt Everest

    China and Nepal are expected to announce the latest official height of Mt. Everest.

    Try this PYQ:

    Q.When you travel to the Himalayas, you will see the following:

    1. Deep gorges
    2. U-turn river courses
    3. Parallel mountain ranges
    4. Steep gradients causing land-sliding

    Which of the above can be said to be the evidences for the Himalayas being young fold mountains?

    (a) 1 and 2 only

    (b) 1, 2 and 4 only

    (c) 3 and 4 only

    (d) 1, 2, 3 and 4

    Mt. Everest

    • Mount Everest or Sagarmatha, Earth’s highest mountain above sea level, is located in the Himalayas between China and Nepal -– the border between them running across its summit point.
    • Its current official elevation – 8,848m – places it more than 200m above the world’s second-highest mountain, K2, which is 8,611m tall and located in Pakistan-occupied Kashmir.
    • The mountain gets its English name from Sir George Everest, a colonial-era geographer who served as the Surveyor General of India in the mid-19th century.
    • Considered an elite climbing destination, Everest was first scaled in 1953 by the Indian-Nepalese Tenzing Norgay and New Zealander Edmund Hillary.

    Everest’s first survey

    • The mission to measure the world’s highest peak was taken up on a serious note in 1847 and culminated with the finding of a team led by Andrew Waugh of the Royal Surveyor General of India.
    • The team discovered that ‘Peak 15’ — as Mt Everest was referred to then — was the highest mountain, contrary to the then-prevailing belief that Mt Kanchenjunga (8,582 m) was the highest peak in the world.
    • Another belief, prevailing even today, is that 8,840 m is not the height that was actually determined by the 19th-century team.
    • That survey, based on trigonometric calculations, is known as the Great Trigonometric Survey of India.

    Why is the height being measured again?

    • Everest’s current official height– 8,848m– has been widely accepted since 1956, when the figure was measured by the Survey of India.
    • The height of the summit, however, is known to change because of tectonic activity, such as the 2015 Nepal earthquake.
    • Its measurement over the decades has also depended on who was surveying.
    • Another debate is whether the height should be based on the highest rock point or the highest snow point.

  • What is the Hangenberg Crisis?

    The explosion of a nearby star — occurred at between Devonian and Carboniferous periods — could have caused a mass extinction event that took place 359 million years ago.

    Try this question from CSP 2018:

    Q.The term “sixth mass extinction/sixth extinction” is often mentioned in the news in the context of the discussion of

    (a) Widespread monoculture Practices agriculture and large-scale commercial farming with indiscriminate use of chemicals in many parts of the world that may result in the loss of good native ecosystems.

    (b) Fears of a possible collision of a meteorite with the Earth in the near future in the manner it happened 65million years ago that caused the mass extinction of many species including those of dinosaurs.

    (c) Large scale cultivation of genetically modified crops in many parts of the world and promoting their cultivationin other Parts of the world which may cause the disappearance of good native crop plants and the loss offood biodiversity.

    (d) Mankind’s over-exploitation/misuse of natural resources, fragmentation/loss, natural habitats, destructionof ecosystems, pollution and global climate change.

    Hangenberg crisis

    • The Earth suffered an intense loss of species diversity that lasted for at least 300,000 years.
    • The event is thought to have been caused by long-lasting ozone depletion, which would have allowed much more of the Sun’s ultraviolet (UV) radiation to reach and harm life on Earth.
    • It was called the Hangenberg crisis.

    What did researchers find?

    • Extensive volcanism and global warming can also rupture the ozone layer but shreds of evidence for these are indefinite as far as the time period is concerned.
    • So, they up that one or more supernovae explosions, at a distance of 65 light-years away from the Earth, may have caused a prolonged loss of ozone.
    • Betelgeuse, a supernova, around 600 light-years away and present outside the kill distance of 25 light-years poses a danger today.
    • Events like gamma-ray bursts, solar eruptions and meteorite collisions end up very soon. As such, they cannot pave the way for gradual ozone depletion that took place at the close of the Devonian aeon.
    • A supernova event can be powerful enough to bathe its galaxy in light for days and months alike. It can be spotted across the universe as well.

    Why Supernovae are considered dangerous?

    • Supernovae (SNe) are quick sources of ionizing photons that include fatal X-rays, UV and gamma rays.
    • Over a longer period of time, the bang clashes with the nearby gas, resulting in a shockwave that causes particle acceleration.
    • As such, cosmic rays are generated by SNe. These charged particles with high energies get magnetically confined on the inside of SN remains.
    • The fossil evidence shows a 300,000-year shrink in biodiversity leading the way to Devonian-Carboniferous Boundary (DCB) mass extinction.
    • This puts forward the possibility of multiple catastrophes or multiple supernovae explosions.

  • PM CARES Fund is a “public charitable trust”: SC

    The Supreme Court has endorsed the PM CARES Fund as a “public charitable trust” to which donors contribute voluntarily.

    Try this question:

    Q. The creation of PM CARES fund is violative of the provision of the Disaster Management Act, 2005. Analyse.

    What is the case?

    • The petition had argued that the PM-CARES Fund was not subject to CAG audit.
    • It was not under “public scrutiny”. Contributions to it were “100% tax-free”.
    • It was accused that there was statutory fund already in existence under the Disaster Management Act of 2005 to receive contributions to finance the fight against a calamity.

    About PM CARES Fund

    • The Prime Minister’s Citizen Assistance and Relief in Emergency Situations Fund (PM CARES Fund) were created on 28 March 2020 following the COVID-19 pandemic in India.
    • The fund will be used for combat, containment and relief efforts against the coronavirus outbreak and similar pandemic like situations in the future.
    • The PM is the chairman of the trust. Members will include the defence, home and finance ministers.
    • The fund will also enable micro-donations. The minimum donation accepted for the PM CARES Fund is â‚č10 (14Âą US).
    • The donations will be tax-exempt and fall under corporate social responsibility.

    What did the Court rule?

    • There is “no occasion” for the Comptroller and Auditor General (CAG) to audit a public charitable trust independent of budgetary support or government money.
    • The court said that PM-CARES is “not open” for a PIL petitioner to question the “wisdom” that created the fund in an hour of need.
    • The court dismissed the idea that the PM CARES was constituted to “circumvent” the National Disaster Response Fund (NDRF).
    • The Bench also refused to direct the transfer of funds from the PM CARES Fund to the NDRF. It said they were two separate entities.

    Also read:

    PM-CARES Fund

  • Tornado’s dynamics and its India connection

    Babu ChunderSikur Chatterjee’s paper was the earliest record of a tornado’s dynamics in the history of meteorology, according to a study.

    Try this PYQ:

    Q. In the South Atlantic and South-Eastern Pacific regions in tropical latitudes, cyclone does not originate. What is the reason? (CSP 2015)

    (a) Sea surface temperatures are low

    (b) Inter-Tropical Convergence Zone seldom occurs

    (c) Coriolis force is too weak

    (d) Absence of land in those regions

    What is a Tornado?

    • A tornado is a rapidly rotating column of air that is in contact with both the surface of the Earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud.
    • The windstorm is often referred to as a twister, whirlwind or cyclone winds blow counterclockwise in the Northern Hemisphere and clockwise in the Southern.
    • Tornadoes come in many shapes and sizes, and they are often visible in the form of a condensation funnel originating from the base of a cumulonimbus cloud, with a cloud of rotating debris and dust beneath it.
    • It is generally accompanied by extreme weather such as heavy downpours, hail storms, and lightning.

    Who was Babu ChunderSikur Chatterjee?

    • Chatterjee was an Indian scientist employed with the Surveyor General of India during the British colonial era.
    • He was likely the first person to scientifically document a tornado’s path in 1865, a study from the Indian Institute of Tropical Meteorology (IITM), Pune, has claimed.
    • Chatterjee had published his findings in a journal named Proceedings of the Asiatic Society of Bengal, in a paper titled ‘Note on a whirlwind at Pundooah’, near Hooghly.
    • The paper described a tornado’s dynamics in meticulous detail and was accompanied by a sketch that mathematically depicted its scale, track and rotation.

    His work

     

    • Chatterjee quantitatively mapped the entire trail of ĂĄ tornado’s destruction.
    • He benefited from the rare opportunity to observe a tornado passing through a railway track where there were conveniently placed markers at predefined locations.
    • This enabled him to observe and make clear measurements of the tornado’s direction, dynamics and path.

    Back2Basics

  • In news: Mauritius Oil Spill

    A Japanese ship recently struck a coral reef resulting in an oil spill of over 1,000 tonnes into the Indian Ocean near Mauritius.

    Try this PYQ:

    Q.Recently, “oil zapper’’ was in the news. What is it? (CSP 2011)

    (a) It is an eco-friendly technology for the remediation of oily sludge and oil spills.

    (b) It is the latest technology developed for undersea oil exploration.

    (c) It is a genetically engineered high biofuel-yielding maize variety.

    (d) It is the latest technology to control the accidentally caused flames from oil wells.

    What caused the Mauritius oil spill?

    • A Japanese vessel struck a coral reef resulting in an oil spill of over 1,000 tonnes into the Indian Ocean.
    • The ship was carrying an estimated 4,000 tonnes of oil.
    • The accident had taken place near two environmentally protected marine ecosystems and the Blue Bay Marine Park Reserve, which is a wetland of international importance.

    How dangerous are oil spills?

    • Oil spills affect marine life by exposing them to harsh elements and destroying their sources of food and habitat.
    • Further, both birds and mammals can die from hypothermia as a result of oil spills.
    • For instance, oil destroys the insulating ability of fur-bearing mammals, such as sea otters.
    • It also decreases the water repellency of birds’ feathers, without which they lose their ability to repel cold water.

    Some major incidents

    • Some of the world’s largest oil spills include the Persian Gulf War oil spill of 1991 when more than 380 million gallons of oil was poured into the northern Persian Gulf by Iraq’s forces.
    • The 2010 Deepwater Horizon oil spill in the Gulf of Mexico is also considered to be among the largest known accidental oil spills in history.
    • Starting April 20, 2010, over 4 million barrels of oil flowed over a period of 87 days into the Gulf of Mexico.

    How is the oil spill cleaned?

    • There are a few ways to clean up oil spills including skimming, in situ burning and by releasing chemical dispersants.
    • Skimming involves removing oil from the sea surface before it is able to reach the sensitive areas along the coastline.
    • In situ burning means burning a particular patch of oil after it has concentrated in one area.
    • Releasing chemical dispersants helps break down oil into smaller droplets, making it easier for microbes to consume, and further break it down into less harmful compounds.
    • Natural actions in aquatic environments such as weathering, evaporation, emulsification, biodegradation and oxidation can also accelerate the recovery of an affected area. But these occur differently in freshwater and marine environments.

  • [pib] Himalayan Geothermal Springs release huge amount of carbon dioxide in the atmosphere

    The Himalayas, which hosts about 600 geothermal springs needs to be considered while estimating emissions to the carbon cycle and thereby to global warming says, Indian researchers.

    Note the following hot springs in India:

    1) Panamik in Nubra valley

    2) Kheer Ganga in Kullu, Himachal

    3) Manikaran Sahib, Himachal

    4) Tattapani, Chhattisgarh

    5) Gaurikund, Uttarakhand

    6) Yumthang, Sikkim

    7) Reshi, Sikkim

    Geothermal springs

    • Geothermal or Hot springs are heated by shallow intrusions of magma (molten rock) in volcanic areas. Some thermal springs, however, are not related to volcanic activity.
    • The water is heated by convective circulation: groundwater percolates downward & reaches depths of a kilometre or more where the temperature of rocks is high because of the normal temperature gradient of the Earth’s crust.

    Why consider the Himalayas?

    • The Himalayan geothermal springs which cover about 10,000 square km in the Garhwal region of Himalaya show a significant discharge of CO2 rich water.
    • The estimated carbon dioxide degassing (removal of dissolved gases from liquids, especially water or aqueous solutions) flux is nearly 7.2 ×106 mol/year to the atmosphere.
    • Such CO2 degassing should be taken into account to assess global carbon outflux in the earth’s atmosphere.

    Where does this CO2 come from?

    • Carbon outflux from Earth’s interior to the exosphere through volcanic eruptions, fault zones, and geothermal systems contribute to the global carbon cycle that effects short and long term climate of the Earth.
    • The CO2 in the thermal springs are sourced from metamorphic decarbonation of carbonate rocks present deep in the Himalayan core along with magmatism and oxidation of graphite.
    • Most of the geothermal water is dominated by evaporation followed by weathering of silicate rocks.
    • Isotopic analyses further point towards a meteoric source for geothermal water.

  • In news: Mount Sinabung

    The Mount Sinabung volcano in Indonesia has erupted spouting ash at least 5,000 metres high into the sky.

    In the Philippines, a volcano called Taal on the island of Luzon; 50 km from Manila has recently erupted in January. Note all such recent eruption in news.

    Also, try this PYQ:

    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? (CSP 2018)

    (a) 1 only

    (b) 2 and 3 only

    (c) 3 only

    (d) 1 and 3

    Mount Sinabung

    • It is a Pleistocene-to-Holocene stratovolcano in the Karo plateau of Karo Regency, North Sumatra, Indonesia.
    • It is created by the subduction of the Indo-Australian Plate under the Eurasian Plate.
    • It erupted in 2010 after a 400-year-long hiatus and has been continuously active since September 2013.