Note4Students
From UPSC perspective, the following things are important :
Prelims level: Agalega Island
Mains level: Indian ocean power competition
Mauritius has denied a report that it has allowed India to build a military base on the remote island of Agalega.
Agalega Island
- Agaléga are two outer islands of Mauritius located in the Indian Ocean, about 1,000 kilometers north of Mauritius island.
- The islands have a total area of 2,600 ha (6,400 acres).
- There is an MoU between the governments of Mauritius and India to develop the Agaléga islands and resolve infrastructural problems faced by Agaleans.
Why in news?
- India asserts that these new facilities are part of its Security and Growth for All in the Region (SAGAR) policy, which aims to increase maritime cooperation between countries in the region.
- Mauritius, for its part, has indicated that its coastguard personnel will use the new facilities.
- But it is clear that the Indian investment of $250m in developing an airfield, port, and communications hub on this remote island is not aimed at helping Mauritius develop its capacity to police its territorial waters.
Significance of this area
- The Agalega area is currently a blind spot for the Indian Navy and by building a military facility in it, New Delhi hopes to expand its maritime domain awareness.
- In times of conflict, knowing the location of enemy ships and submarines, without being detected in the process, creates a significant advantage.
- China’s naval forays into this region are the true motivator for its expanding naval presence.
- In peacetime, effective maritime domain awareness helps establish international partnerships with like-minded militaries and also acts as a deterrent to both state and non-state adversaries, by signaling reach.
Conclusion
- The Indian Ocean is now increasingly contested.
- Whether or not China is deterred by India’s surveillance efforts, Agaléga is now a pawn in this new era of major power competition across the Indian Ocean and indeed the wider Indo-Pacific region.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: South China Sea
Mains level: South China Sea Dispute
Pentagon chief has said that Beijing’s expansive claims in the South China Sea have “no basis in international law”, taking aim at China’s growing assertiveness in the hotly contested waters.
South China Sea Dispute
- It is a dispute over territory and sovereignty over ocean areas, and the Paracels and the Spratlys – two island chains claimed in whole or in part by a number of countries.
- China, Vietnam, the Philippines, Taiwan, Malaysia, and Brunei all have competing claims.
- Alongside the fully-fledged islands, there are dozens of rocky outcrops, atolls, sandbanks, and reefs, such as the Scarborough Shoal.
- China claims by far the largest portion of territory – an area defined by the “nine-dash line” which stretches hundreds of miles south and east from its most southerly province of Hainan.
- Beijing says its right to the area goes back centuries to when the Paracel and Spratly island chains were regarded as integral parts of the Chinese nation, and in 1947 it issued a map detailing its claims.
- It showed the two island groups falling entirely within its territory. Those claims are mirrored by Taiwan.
Spat over Chinese claims
- China has backed its expansive claims with island-building and naval patrols.
- The US says it does not take sides in territorial disputes but has sent military ships and planes near disputed islands, calling them “freedom of navigation” operations to ensure access to key shipping and air routes.
- Both sides have accused each other of “militarizing” the South China Sea.
- There are fears that the area is becoming a flashpoint, with potentially serious global consequences.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Nord Stream 2 Pipeline
Mains level: Not Much
The US, which had previously imposed sanctions to prevent the completion of a major new gas pipeline between Russia and Germany, has now signaled its approval for the project.
Nord Stream 2 Pipeline
- It is a system of offshore natural gas pipelines running under the Baltic Sea from Russia to Germany.
- It includes two active pipelines running from Vyborg to Lubmin near Greifswald forming the original Nord Stream, and two further pipelines under construction running from Ust-Luga to Lubmin termed Nord Stream 2.
- In Lubmin the lines connect to the OPAL line to Olbernhau on the Czech border and to the NEL line to Rehden near Bremen.
- The first line Nord Stream-1 was laid and inaugurated in 2011 and the second line in 2012.
- At 1,222 km in length, Nord Stream is the longest sub-sea pipeline in the world, surpassing the Langeled pipeline.
Why is the pipeline controversial?
- The US believed that the project would increase Europe’s dependence on Russia for natural gas.
- Currently, EU countries already rely on Russia for 40 percent of their gas needs.
- The project also has opponents in eastern Europe, especially Ukraine, whose ties with Russia have seriously deteriorated in the aftermath of the Crimean conflict in 2014.
- There is an existing land pipeline between Russia and Europe that runs through Ukraine.
- The country feels that once Nord Storm 2 is completed, Russia could bypass the Ukrainian pipeline, and deprive it of lucrative transit fees of around $3 billion per year.
- Ukraine also fears another invasion by Russia once the new pipeline is operational.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Great Barrier Reef
Mains level: Coral Reefs and their significance
Chinese official has said that political tensions between Beijing and Australia were not behind a UNESCO recommendation to place the Great Barrier Reef on its endangered list.
Great Barrier Reef
- The Great Barrier Reef is the world’s largest coral reef system composed of over 2,900 individual reefs and 900 islands.
- It is stretched for over 2,300 kilometres over an area of approximately 344,400 square kilometres.
- The reef is located in the Coral Sea, off the coast of Queensland, Australia.
- It was world heritage listed in 1981 by UNESCO as the most extensive and spectacular coral reef ecosystem on the planet.
Importance of Corals
Coral reefs are some of the most diverse and valuable ecosystems on Earth.
- They support more species per unit area than any other marine environment, including about 4,000 species of fish, 800 species of hard corals and hundreds of other species.
- This biodiversity is considered key to finding new medicines for the 21st century.
- Medical use: Many drugs are now being developed from coral reef animals and plants as possible cures for cancer, arthritis, human bacterial infections, viruses, and other diseases.
- Fisheries: Healthy coral reefs support commercial and subsistence fisheries as well as jobs and businesses through tourism and recreation.
- Local economies receive billions of dollars from visitors to reefs through diving tours, recreational fishing trips, hotels, restaurants, and other businesses based near reef ecosystems.
- Coral reef structures also buffer shorelines against 97 per cent of the energy from waves, storms, and floods, helping to prevent loss of life, property damage, and erosion.
Answer this PYQ in the comment box:
Q.Consider the following statements:
- Most of the world’s coral reefs are in tropical waters.
- More than one-third of the world’s coral reefs are located in the territories of Australia, Indonesia and the Philippines.
- Coral reefs host far more number of animal phyla than those hosted by tropical rainforests.
Which of the above statements is/are correct?
(a) 1 and 2 only
(b) 3 only
(c) 1 and 3 only
(d) 1 and 3 only
Back2Basisc: Coral Reef
- Coral reefs are built by and made up of thousands of tiny animals—coral “polyps”—that are related to anemones and jellyfish.
- Polyps are shallow-water organisms that have a soft body covered by a calcareous skeleton. The polyps extract calcium salts from seawater to form these hard skeletons.
- The polyps live in colonies fastened to the rocky seafloor.
- The tubular skeletons grow upwards and outwards as a cemented calcareous rocky mass collectively called corals.
- When the coral polyps die, they shed their skeleton on which new polyps grow.
- The cycle is repeated for millions of years leading to the accumulation of layers of corals shallow rock created by these depositions is called a reef.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Lemru Elephant Reserve
Mains level: Man-Animal Conflict
The proposed Lemru Elephant Reserve in Chhattisgarh, in the pipeline for 20 years, has become the subject of yet another controversy over the reduction of its size.
Lemru Elephant Reserve
- The proposal for the reserve, in Korba district, was passed unanimously by the Assembly in 2005 and got central approval in 2007.
- Lemru is one of two elephant reserves planned to prevent human-animal conflict in the region, with elephants moving into Chhattisgarh from Odisha and Jharkhand.
- Its area was then proposed to be 450 sq km.
Why does the government want to reduce the size of the reserve?
- The area proposed under the reserve is part of the Hasdeo Aranya forests, a very diverse biozone that is also rich in coal deposits.
- Of 22 coal blocks in the area, seven have already been allotted with mines running in three, and in the process of being established in the other four.
- Under the ‘No-Go Area’ policy from the UPA area, the entire area was considered out of bounds for mines, but in 2020, five coal blocks from the region were put on the auction list.
Why is the reserve important?
- North Chhattisgarh alone is home to over 240 elephants.
- Elephants in Chhattisgarh are relatively new; they started moving into undivided Madhya Pradesh in 1990.
- Since these animals were relatively new, the human-animal conflict started once elephants started straying into inhabited areas, looking for food.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Black Sea mapping
Mains level: Not Much
Russia accused Britain of spreading lies over a warship confrontation in the Black Sea.
What is the issue?
- Russia annexed Ukraine’s Crimean Peninsula in 2014, a move that was not recognized by most countries in the world.
- Russia has frequently responded at NATO warships visits near Crimea, casting them as destabilizing.
- NATO members Turkey, Greece, Romania and Bulgaria are in the Black Sea, but warships from the US, UK and other NATO allies also have made increasingly frequent visits in a show of support to Ukraine.
About Black Sea
- The Black Sea is a marginal sea of the Atlantic Ocean lying between Europe and Asia; east of the Balkans (Southeast Europe), south of the East European Plain in Eastern Europe, west of the Caucasus, and north of Anatolia in Western Asia.
- It is supplied by major rivers, principally the Danube, Dnieper, and Don.
- The watersheds of many countries drain into the sea beyond the six that share its coast.
- The Black Sea is bordered by Bulgaria, Georgia, Romania, Russia, Turkey, and Ukraine.
Must answer this PYQ in the comment box:
Q.Consider the following pairs:
|
Sea
|
Bordering country
|
| 1. Adriatic Sea |
Albania |
| 2. Black Sea |
Croatia |
| 3. Caspian Sea |
Kazakhstan |
| 4. Mediterranean Sea |
Morocco |
| 5. Red Sea |
Syria |
Which of the pair given above are correctly matched? (CSP 2020)
(a) 1, 2 and 4 only
(b) 1, 3 and 4 only
(c) 2 and 5 only
(d) 1, 2, 3, 4 and 5
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From UPSC perspective, the following things are important :
Prelims level: Yellowstone National Park
Mains level: NA
A new assessment of climate change in the Yellowstone National Park shows that it has lost a quarter of its annual snowfall.
Yellowstone National Park
- Yellowstone NP is an American national park located in the western United States, largely in the northwest corner of Wyoming and extending into Montana and Idaho.
- Yellowstone was the first national park in the US and is also widely held to be the first national park in the world.
- The park is known for its wildlife and its many geothermal features, especially Old Faithful geyser, one of its most popular.
- While it represents many types of biomes, the subalpine forest is the most abundant. It is part of the South Central Rockies forests ecoregion.
- The area also represents the one point where the three major river basins of the western U.S. converge.
- The rivers of the Snake-Columbia basin, Green-Colorado basin, and Missouri River Basin all begin as snow on the Continental Divide as it weaves across Yellowstone’s peaks and plateaus.
Impact of climate change
- Since 1950, average temperatures in the Greater Yellowstone Area have risen 1.3°C and potentially, more importantly, the region has lost a quarter of its annual snowfall.
- The loss of snow there has repercussions for a vast range of ecosystems and wildlife, as well as cities and farms downstream that rely on rivers that start in these mountains.
- It is home to the southernmost range of grizzly bear populations in North America and some of the longest intact wildlife migrations, including the seasonal traverses of elk, pronghorn, mule deer and bison.
Answer this PYQ in the comment box:
Q.Consider the following pairs:
River Flows into
1. Mekong – Andaman Sea
- Thames – Irish Sea
- Volga – Caspian Sea
- Zambezi – Indian Ocean
Which of the statements given above is/are correct? (CSP 2020)
(a) 1 and 2 only
(b) 3 only
(c) 3 and 4 only
(d) 1,2 and 4 only
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Southern Ocean
Mains level: NA
The National Geographic magazine has recognized the ‘Southern Ocean’ as the world’s fifth ocean June 8, 2021 hoping others will soon follow suit.
Answer this PYQ from CSP 2019 in the comment box:
Q.The most important fishing grounds of the world are found in the regions where:
(a) warm and cold atmospheric currents meet
(b) rivers drain out large amounts of freshwater into the sea
(c) warm and cold oceanic currents meet
(d) continental shelf is undulating
Southern Ocean
- The Southern Ocean, also known as the Antarctic Ocean, comprises the southernmost waters of the World Ocean, generally taken to be south of 60° S latitude and encircling Antarctica.
- As such, it is regarded as the second-smallest of the five principal oceanic divisions: smaller than the Pacific, Atlantic, and Indian oceans but larger than the Arctic Ocean.
- Over the past 30 years, the Southern Ocean has been subject to rapid climate change, which has led to changes in the marine ecosystem.
What has NatGeo attempted?
- The magazine says the Southern Ocean is the only ocean ‘to touch three other oceans and to completely embrace a continent rather than being embraced by them’.
- Its northern limit is a latitude of 60 degrees south.
- It is also defined by its Antarctic Circumpolar Current that was formed 34 million years ago. The current flows from west to east around Antarctica.
- The Southern Ocean is home to large populations of whales, penguins, and seals.
Why such a move?
- Usually, the magazine has followed the International Hydrographic Organization (IHO) on marine names, it said in an article notifying the change.
- The IHO too had recognized ‘Southern Ocean’ as a distinct body of water surrounding Antarctica in 1937 but had repealed the same in 1953.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Sardar Sarovar Dam
Mains level: NA
The Sardar Sarovar Dam is providing irrigation water in summer for the first time in history.
Sardar Sarovar Dam
- The Sardar Sarovar Narmada Dam is a terminal dam built on the Narmada river at Kevadia in Gujarat’s Narmada district.
- Four Indian states, Gujarat, Madhya Pradesh, Maharashtra and Rajasthan, receive water and electricity supply from the dam.
- The foundation stone of the project was laid out by Prime Minister Jawaharlal Nehru on 5 April 1961.
- The project took form in 1979 as part of a development scheme funded by the World Bank through their International Bank for Reconstruction and Development, to increase irrigation and produce hydroelectricity
- Called the ‘lifeline of Gujarat’, it usually has no water for irrigation during summers.
Answer this PYQ in the comment box:
Q.Which one of the following pairs is not correctly matched?
Dam/Lake River
(a) Govind Sagar: Satluj
(b) Kolleru Lake: Krishna
(c) Ukai Reservoir: Tapi
(d) Wular Lake: Jhelum
A successful model of river water sharing
- River Narmada is a classic case of Integrated River Basin Planning, Development, and Management, with water storage available in all major, medium, and minor dams on the main river and its tributaries.
- Its water is shared amongst four party states – Gujarat, Rajasthan, Madhya Pradesh and Maharashtra — in the ratio stipulated by the 1979 award of the Narmada Water Dispute Tribunal.
How has it saved water for summers?
- During the monsoon from July to October, the reservoir operation is well synchronized with the rain forecast in the catchment area.
- The strategic operation of River Bed Power House (RPBH) ensures that minimum water flows downstream into the sea and maximum water is used during the dam overflow period, which is not calculated in the annual water share.
- These measures help in maximizing the annual allocation of water share.
- Similarly, in non-monsoon months, the measures for efficient use of the allocated share typically include minimizing the conventional and operational losses.
- It includes: avoiding water wastage, restricting water-intensive perennial crops, adopting of Underground Pipelines (UGPL); proper maintenance and operation of canals on a rotational basis.
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From UPSC perspective, the following things are important :
Prelims level: Dihing Patkai NP
Mains level: NA
The Assam government has notified Dihing Patkai as a National Park, four days after creating the 422-sq. km Raimona National Park in western Assam’s Kokrajhar district.
Dihing Patkai NP
- Dihing Patkai, in focus a year ago for illegal coal mining in the vicinity, encompasses the erstwhile Dehing Patkai Wildlife Sanctuary, the Jeypore Reserve Forest and the western block of the Upper Dihing Reserve Forest.
- The 234.26-sq. km Dihing Patkai straddling eastern Assam’s Dibrugarh and Tinsukia districts is a major elephant habitat and 310 species of butterflies have been recorded there.
- The park has 47 species each of reptiles and mammals, including the tiger and clouded leopard.
Answer this PYQ in the comment box:
Q.Which one of the following National Parks has a climate that varies from tropical to subtropical, temperate and arctic?
(a) Khangchendzonga National Park
(b) Nandadevi National Park
(c) Neora Valley National Park
(d) Namdapha National Park
NPs in Assam
- Assam now has the third most National Parks after the 12 in Madhya Pradesh and nine in the Andaman and Nicobar Islands.
- The five older National Parks in the State are Kaziranga, Manas, Nameri, Orang and Dibru-Saikhowa.
- Kaziranga and Manas are UNESCO World Heritage Sites.
- They are also tiger reserves along with Nameri and Orang.
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From UPSC perspective, the following things are important :
Prelims level: Aravali Range and its geophysics
Mains level: NA
The Supreme Court has ordered the Haryana government to take “all essential measures” to remove encroachments, including some residential constructions, in the ecologically fragile Aravali forest land near a village.
Aravali Range
- The Aravali is a mountain range in Northwestern India, running approximately 670 km in a southwest direction, starting near Delhi, passing through southern Haryana and Rajasthan, and ending in Gujarat.
- The highest peak is Guru Shikhar at 1,722 meters.
- The Aravalli Range, an eroded stub of ancient mountains, is the oldest range of fold mountains in India.
- The natural history of the Aravalli Range dates back to times when the Indian Plate was separated from the Eurasian Plate by an ocean.
- Three major rivers and their tributaries flow from the Aravalli, namely Banas and Sahibi rivers which are tributaries of Yamuna, as well as Luni River which flows into the Rann of Kutch.
- The Sariska-Delhi leopard wildlife corridor is a 200 km long important biodiversity and wildlife corridor which runs from the Sariska Tiger Reserve in Rajasthan to Delhi Ridge.
Threats to its existence
- Ecological degradation in the Aravalli region is in an alarming situation.
- This is due to the increasing population of humans and cattle, injudicious use of natural resources, unscientific mining, uncontrolled grazing, and felling of trees.
Answer this PYQ in the comment box:
Q.With reference to the river Luni, which one of the following statements is correct?
(a) It fl ows into Gulf of Khambhat
(b) It fl ows into Gulf of Kuchchh
(c) It fl ows into Pakistan and merges with a tributary of Indus
(d) It is lost in the marshy land of the Rann of Kuchchh
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From UPSC perspective, the following things are important :
Prelims level: Kinnaur Hydroelectric Project
Mains level: Hydel energy and its feasiblity
The people of Kinnaur, Himachal Pradesh have been protesting against the proposed 804-megawatt Jangi Thopan Powari hydroelectricity project (JTP HEP) over the Satluj since April 2021.
Kinnaur Hydroelectric Project
- The run-of-the-river (ROR) project envisages the construction of a concrete gravity dam of ±88 metres high above the deepest foundation level across river Satluj near Jangi village.
- The diversion of water will involve the construction of a 12-km-long tunnel.
- The tentative land requirement for the project is 295.93 hectares, out of which 270.43 ha is forest land and 25.5 ha is private.
- Construction of the dam will result in the submergence of about 156.2917 ha of land, out of which 143.2093 ha is forest land and 13.0824 ha is private.
Answer this PYQ in the comment box:
Q.What is common to the places known as Aliyar, Isapur and Kangsabati? (CSP 2017)
(a) Recently discovered uranium deposits
(b) Tropical rain forests
(c) Underground cave systems
(d) Water reservoirs
Why are people protesting?
- Kinnaur district is mainly marked by its cold desert, tribal population, fragile topography, rich and diverse culture, apple orchards, off-season vegetables and the Satluj river.
- The river has been dammed at multiple places along the valley to create an additional feature to Kinnaur’s identity as Himachal’s hydropower hub, which locals believe is a malediction.
- An integral part of the old Hindustan-Tibetan Route, Jangram Valley, lies on the right bank of the Satluj river in the district.
- This is not the first time that the cold desert has witnessed such a contestation.
Sutlej is oveloaded
- The Satluj has taken the biggest load of state hydropower ambition since the early 90s. Out of the total installed capacity, 56 per cent (5720MW) is done in the Satluj basin.
- According to the State of the Rivers of Himachal Pradesh Report 2017:
- In other words, 92 per cent of the river will either be flowing through tunnels or will be part of reservoirs.
- Such a cumulative scale of disturbance with the river’s natural state drastically impacted the life, livelihood and ecology in the Satluj basin.
Why need hydroelectric projects?
- Hydropower is a necessary choice for the nation’s clean energy transition.
- In purely technological terms, hydropower projects are an engineering marvel and generate clean, reliable electricity.
- HEPs are not viable just from the local livelihood and environmental point of view but they have also failed on the financial viability side.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Sea Snot, Marmara Sea
Mains level: Algal bloom
There has been growing environmental concern in Turkey over the accumulation of ‘sea snot’, a slimy layer of grey or green sludge in the country’s seas, which can cause considerable damage to the marine ecosystem.
What is ‘Sea Snot’?
- ‘Sea snot’ is marine mucilage that is formed when algae are overloaded with nutrients as a result of water pollution combined with the effects of climate change.
- A ‘sea snot’ outbreak was first recorded in the country in 2007. Back then, it was also spotted in the Aegean Sea near Greece.
- But the current outbreak in the Sea of Marmara is by far the biggest in the country’s history.
- The nutrient overload occurs when algae feast on warm weather caused by global warming. Water pollution adds to the problem.
- Environmental experts have said that the overproduction of phytoplankton caused by climate change and the uncontrolled dumping of household and industrial waste into the seas has led to the present crisis.
Where has it been found?
- Turkey’s Sea of Marmara, which connects the Black Sea to the Aegean Sea, has witnessed the largest outbreak of ‘sea snot’.
- The sludge has also been spotted in the adjoining Black and Aegean seas.
How badly can the crisis affect the marine ecosystem?
- The growth of the mucilage, which floats upon the surface of the sea like brown phlegm, is posing a severe threat to the marine ecosystem of the country.
- Divers have said that it has caused mass deaths among the fish population, and also killed other aquatic organisms such as corals and sponges.
- The mucilage is now covering the surface of the sea and has also spread to 80-100 feet below the surface.
- If unchecked, this can collapse to the bottom and cover the sea floor, causing major damage to the marine ecosystem.
- Over a period of time, it could end up poisoning all aquatic life, including fishes, crabs, oysters, mussels and sea stars.
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From UPSC perspective, the following things are important :
Prelims level: Pandav leni complex
Mains level: Ancient buddhist cave architecture
The Archaeological Survey of India (ASI) has found three more caves in the Trirashmi Buddhist cave complex, also known as Pandav Leni, near Nashik, Maharashtra.
Answer this PYQ first, in the comment box:
Q.There are only two known examples of cave paintings of the Gupta period in ancient India. One of these is paintings of Ajanta caves. Where is the other surviving example of Gupta paintings?
(a) Bagh caves
(b) Ellora caves
(c) Lomas Rishi cave
(d) Nasik caves
Pandav Leni Complex
- The Pandav Leni Complex or Nasik Caves are a group of 23 caves carved between the 1st century BCE and the 3rd century CE.
- Also called Trirashmi Buddhist caves, this complex was first documented in 1823 by Captain James Delamaine and is now an ASI- protected site.
- Though additional sculptures were added up to about the 6th century, it is a major landmark of changes in Buddhist devotional practices.
- Most of the caves are viharas except for Cave 18 which is a chaitya of the 1st century BCE.
- The style of some of the elaborate pillars or columns, for example in caves 3 and 10, is an important example of the development of the form.
- The “Pandavleni” name sometimes given to the Nasik Caves has nothing to do with the characters Pandavas, characters in the Mahabharata epic.
- Other caves in the area are Karla Caves, Bhaja Caves, Patan Cave, and Bedse Caves.
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From UPSC perspective, the following things are important :
Prelims level: Mount Nyiragongo
Mains level: Not Much
Thousands have fled a volcanic eruption in the Democratic Republic of Congo from Mount Nyiragongo on the outskirts of Goma City.
These were some volcanoes in news this year:
Mount Vesuvius, Taal Volcano, La Soufriere
Mount Nyiragongo
- Mount Nyiragongo is an active stratovolcano with an elevation of 3,470 m (11,385 ft) in the Virunga Mountains associated with the Albertine Rift.
- The main crater is about 2km wide and usually contains a lava lake.
- The crater presently has two distinct cooled lava benches within the crater walls.
- It is one of the 16 Decade Volcanoes.
- Nyiragongo’s lava lake has at times been the most voluminous known lava lake in recent history. The depth of the lava lake varies considerably.
- Nyiragongo and nearby Nyamuragira are together responsible for 40 percent of Africa’s historical volcanic eruptions.
Answer this PYQ in the comment box:
Q.Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth?
- Volcanic action
- Respiration
- Photosynthesis
- Decay of organic matter
Select the correct answer using the code given below:
(a) 1 and 3 only
(b) 2 only
(c) 1, 2 and 4 only
(d) 1, 2, 3 and 4
What are Decade Volcanoes?
- The Decade Volcanoes are 16 volcanoes identified by the International Association of Volcanology and Chemistry of the Earth’s Interior (IAVCEI).
- They are considered worthy of particular study in light of their history of large, destructive eruptions and proximity to densely populated areas.
- They are named Decade Volcanoes because the project was initiated in the 1990s as part of the United Nations-sponsored International Decade for Natural Disaster Reduction.
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From UPSC perspective, the following things are important :
Prelims level: A-76 Iceberg
Mains level: Impact of climate changes on Cryosphere
A huge ice block has broken off from western Antarctica into the Weddell Sea, becoming the largest iceberg in the world and earning the name A-76.
Answer this PYQ in the comment box:
Q.On the planet earth, most of the freshwater exists as ice caps and glaciers. Out of the remaining freshwater, the largest proportion:
(a) is found in the atmosphere as moisture and clouds
(b) is found in freshwater lakes and rivers
(c) exists as groundwater
(d) exists as soil moisture
A-76 Iceberg
- A-76 is the latest in a series of large ice blocks to dislodge in a region acutely vulnerable to climate change, although scientists said in this case it appeared to be part of a natural polar cycle.
- The iceberg, measuring around 170 km long and 25 km wide, with an area of 4,320 sq km is now floating in the Weddell Sea.
- Slightly larger than the Spanish island of Majorca, A-76 had been monitored by scientists since it began to separate from the Ronne Ice Shelf.
- It joins the previous world’s largest title holder A-23A — approximately 3,880 sq. km. in size — which has remained in the same area since 1986.
- A-76 was originally spotted by the British Antarctic Survey and the calving — the term used when an iceberg breaks off — was confirmed using images from the Copernicus satellite.
Note: An iceberg is a large piece of freshwater ice that has broken off a glacier or an ice shelf and is floating freely in open water.
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From UPSC perspective, the following things are important :
Prelims level: Map marking of Paracel Islands
Mains level: South China Sea Row
A United States warship sailed through the Paracel Islands in the disputed South China Sea.
Paracel Islands
- The Paracel Islands, also known as the Xisha Islands are a disputed archipelago in the South China Sea.
- The archipelago includes about 130 small coral islands and reefs, most grouped into the northeast Amphitrite Group or the western Crescent Group.
- They are distributed over a maritime area of around 15,000 square kilometers with a land area of approximately 7.75 square kilometers.
- The archipelago includes Dragon Hole, the deepest underwater sinkhole in the world.
- It is surrounded by productive fishing grounds and a seabed with potential, but as yet unexplored, oil and gas reserves.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Sites mentioned in the news
Mains level: Not Much
Six sites have been added to India’s tentative list of UNESCO world heritage sites.
Which are the 6 sites?
- Ganga ghats in Varanasi
- Temples of Kancheepuram in Tamil Nadu
- Satpura Tiger Reserve in Madhya Pradesh
- Maratha military architecture in Maharashtra
- Hire Bengal megalithic site in Karnataka and
- Bhedaghat-Lametaghat of Narmada Valley in Madhya Pradesh
[1] Ghats of Varanasi
- The Ganges riverfront of Varanasi, Uttar Pradesh, has been vying for the UNESCO tag for several years now.
- The Ganga river with its riverfront ghats also fulfil the criteria of Cultural Landscapes as designated in Article 1 of the Convention and specifically that of a cultural landscape/
- It retains an active social role in contemporary society closely associated with the traditional way of life, and in which the evolutionary process is still in progress.
[2] Temples of Kanchipuram
- Synonymous with spirituality, serenity, and silk, the temple town of Kanchipuram in Tamil Nadu, is dotted with ancient temples that are architectural marvels and a visual treat, states incredibleindia.org.
- Situated on the banks of River Vegavathi, this historical city once had 1,000 temples, of which only 126 (108 Shaiva and 18 Vaishnava) now remain.
- Its rich legacy has been the endowment of the Pallava dynasty, which made the region it’s capital between the 6th and 7th centuries and lavished upon its architectural gems that are a fine example of Dravidian styles.
[3] Satpura Tiger Reserve
- Located in Madhya Pradesh, the Satpura National Park is home to 26 species of the Himalayan region including reptiles, and 42 species of Nilgiri areas.
- It is the largest tiger-occupied forest and also has the largest tiger population.
- The website also states the place has more than 50 rock shelters with paintings that are 1500 to 10,000 years old.
[4] Maratha Military Architecture in Maharashtra
- There are 12 forts in Maharashtra dating back to the era of the 17th-century Maratha king Chhatrapati Shivaji.
- They are namely Shivneri (the birthplace of Shivaji); Raigad (the capital fort rebuilt for the coronation of the Maratha king), Torna (the first fort of the Maratha empire), Rajgad, Salher-Mulher, Panhala, Pratapgad, Lohagad, Sindhudurg, Padmadurga (Kasa), Vijaydurg and Kolaba.
- This highlight how the formation of Military Landscape in the form of hill and sea forts as a response to hilly terrain in the area is of outstanding universal value.
[5] Megalithic site of Hire Benkal
- The 2,800-years-old megalithic site of Hire Benkal in Karnataka is one of the largest prehistoric megalithic settlements where some funerary monuments are still intact.
- The granite structures are burial monuments that may also have served many ritual purposes.
- Due to the extremely valuable collection of Neolithic monuments, the site was proposed for recognition.
[6] Bhedaghat-Lametaghat in Narmada Valley- Jabalpur
- Bhedaghat, often referred to as the Grand Canyon of India, is a town in the Jabalpur district, around 25 km from Jabalpur.
- It is known for its marble rocks and their various morphological forms on either side of the Narmada River which flows through the gorge states whcunesco.org.
- It has also been observed that the magical marble mountains assume different colours and even shapes of animals and other living forms as one moves through them.
- Several dinosaur fossils have been found in the Narmada valley, particularly in Bhedaghat-Lametghat area of Jabalpur. In 1828, the first Dinosaur fossil was collected from Lameta Bed by William Sleeman.
- River Narmada narrows down on its way through marble rocks and plunges in a waterfall giving out the appearance of a smoke cascade.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Leang Sakapao Caves
Mains level: Not Much
Researchers have reported that Pleistocene-era rock paintings dating back to 45,000-20,000 years ago in cave sites in southern Sulawesi, on the Indonesian island of Sulawesi, are weathering at an alarming rate.
Have you ever found the mention of ‘Altamira Caves’ in your NCERTs?
Leang Sakapao Caves
- This cave art of Sulawesi is much older than the prehistoric cave art of Europe.
- The artwork in the area includes what is believed to be the world’s oldest hand stencil (almost 40,000 years ago), created by pressing the hand on a cave wall and spraying wet red-mulberry pigments over it.
- A nearby cave features the world’s oldest depiction of an animal, a warty pig painted on the wall 45,500 years ago.
Impact of climate change
- The artwork made with pigments was decaying due to a process known as haloclasty, which is triggered by the growth of salt crystals due to repeated changes in temperature and humidity.
- This is caused by alternating wet and dry weather in the region.
- Indonesia has also experienced several natural disasters in recent years, which have quickened the process of deterioration.
Note:
Mark all islands of the Indonesian Archipelago in your Atlas.
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From UPSC perspective, the following things are important :
Prelims level: Farzad B Gas Field
Mains level: Not Much
Iran gave the Farzad B gas field to a domestic gas producer in a setback move to India.
Farzad B Gas Field
- Farzad-B is an off-shore natural gas field 20 kilometres off Farsi Island in Iran.
- The gas field was discovered in 2008 by a consortium of three Indian companies, led by the state-owned ONGC Videsh with a 40% stake; the other companies were Indian Oil Corporation (40%) and Oil India (20%).
Deal soured after US sanctions
- Negotiations between the consortium and the National Iranian Oil Company (NIOC) to develop the gas field stalled due to secondary sanctions against Iran by the US and the European Union in the early 2010s.
- Following the lifting of sanctions after the Joint Comprehensive Plan of Action was signed in July 2015 the consortium was close to an agreement to invest $US5 billion to develop the gas field.
- After the United States withdrawal from the JCPOA in May 2018, and the reinstatement of U.S. sanctions against Iran, the negotiations between the consortium and NIOC broke down.
Consider the question “Balancing the contrasts has been the basis of India’s relations with Iran. Comment.”
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