Ujani Dam
May 24, 2024↓Source-This post on Ujani Dam has been created based on the article “6 Drown As Boat Capsizes In Dam Backwaters In Pune” published in “NDTV” on 24 May 2024.
Why in News?
Recently, a boat capsized in the backwaters of Ujani Dam in Maharashtra’s Pune district, drowning six persons, including two children.
About Ujani Dam
Source: Loksatta 1. Ujani Dam is situated on the Bhima River near Ujjani village in the Solapur district of Maharashtra.
2. This earth-fill and masonry gravity dam was built between 1977 and 1980. It stretches 2,534 meters in length and stands 63 meters high.
3. The dam’s structure, including a 602-meter-long spillway, is supported by massive basaltic rock formations.
4. Purpose: The dam was primarily constructed to provide irrigation water and hydroelectric power to the region.
5. Capacity and Storage: Ujani Dam has a capacity of 117 thousand million cubic feet (TMC), divided into 54 TMC of live storage and 63 TMC of dead storage.
The dam has a hydroelectric power generation capacity of 12 MW.
6. Environmental Concerns: The water quality in Ujani Dam is notably poor, containing hazardous pollutants. This pollution primarily comes from Pune and other smaller cities along the Bhima River and its tributaries.
About Bhima River
1. It is also known also as the Chandrabagha River. It is a major river in southwest India and primarily a tributary of the Krishna River.
2. It originated in the Bhimashankar hills near Karjat, located on the western side of the Western Ghats, in Pune District, Maharashtra.
3. It flows southeast through Maharashtra, Karnataka, and Telangana, merging into the Krishna River at Kadlur (Raichur), Karnataka.
4. It is bordered by the Western Ghats to the west, the Balaghat Range to the north, and the Mahadeo Hills to the south. Its major Tributaries includes rivers such as Sina and Nira.
5. Pandharpur which is an important pilgrimage center is situated on the right bank of the Bhima River.
UPSC Syllabus: Environment, Geography
Auroras
May 13, 2024↓Source-This post on Auroras is based on the article “Aurora Borealis: What are northern and southern lights? Why do they occur?” published in “The Indian Express” on 12th May 2024.
Why in the News?
A powerful solar storm recently caused a dazzling array of colors to light up the skies in several locations worldwide.
About Auroras
Source: The Indian Express 1. About Auroras: They are natural phenomena characterized by bright, swirling curtains of light that illuminate the night sky.
i) These dazzling displays manifest in various colours, including blue, red, yellow, green, and orange.
ii) It is termed aurora borealis in the north and aurora Australis in the south. They primarily occur near the poles but can occasionally extend to lower latitudes.
2. Causes of Auroras: Auroras stem from solar activity, particularly from the surface of the Sun.
i) The Sun emits a continuous stream of charged particles, predominantly electrons and protons, known as the solar wind.
ii) As this solar wind interacts with the Earth’s magnetic field, it creates a protective shield.
iii) However, some charged particles become trapped in the Earth’s magnetic field and travel along magnetic field lines to the poles.
iv) Upon reaching the upper atmosphere, these particles collide with gases, resulting in luminous flashes that illuminate the sky. Oxygen collisions produce green light, while nitrogen collisions generate shades of blue and purple.
3. Expansion to Midlatitudes: Auroras extend to midlatitudes during periods of intense solar activity.
i) Solar flares and coronal mass ejections (CMEs) increase solar wind intensity, leading to geomagnetic storms.
ii) These storms are characterized by temporary disturbances in the Earth’s magnetic field. It allows auroras to be visible in mid-latitudes.
4. Recent Events and Impact: A recent geomagnetic storm triggered by a CME led to widespread auroral displays.
i) It is classified as “extreme” by the National Oceanic and Atmospheric Administration (NOAA).
ii) This storm may affect various space-dependent operations, including GPS, radio communications, flight operations, power grids, and space exploration programs.
UPSC Syllabus: Science and technology
Shinku La tunnel
May 9, 2024↓Source-This post on Shinku La tunnel has been created based on the article” BRO to complete 2 roads near China border, start work on world’s highest tunnel” published in “Hindustan Times” on 7 May 2024.
Why in the news?
The Border Roads Organisation is getting ready to start building the Shinku La tunnel, the world’s highest tunnel. This will create a reliable connection from Manali to Leh through the Nimmu-Padam-Darcha route.
About Shinku La tunnel
Source-Hindustan Times Description– This tunnel will become the world’s highest tunnel at 15,800 ft, surpassing Mila tunnel in China at 15,590 ft.
Length– 4.1-km long
Location– Nimmu-Padam-Darcha route.
Constructed by– Border Roads Organisation
What is the significance of this tunnel?
1) The route via Nimmu-Padam-Darcha axis will provide third connectivity option to Ladakh. The tunnel will cut the distance between Manali and Leh by 60 km, bringing it down from 355 to 295 km. It is an alternative to the Manali-Leh-Kargil route.
2) It will fasten the transportation of large equipment to key areas like Kargil, Siachen and the Line of Control (LOC).
About Border Road Organization
Establishment: It was formed on 7 May, 1960, to secure India’s borders and develop infrastructure in remote areas of the north and north-east states of the country.
Functions– It develops and maintains road networks in India’s border areas and friendly neighbouring countries. Since its inception, BRO has constructed 62,214 km of roads, 1,005 bridges, seven tunnels and 21 airfields along India’s borders as well as in friendly countries, including Bhutan, Myanmar, Afghanistan and Tajikistan
Read more- Zoji La
UPSC Syllabus-Geography in news
Darfur Region (Sudan)
May 9, 2024↓Source- This post on Darfur Region (Sudan) is based on the article “People eating ‘grass and peanut shells’ in Darfur” published in CNN on “3rd May 2024”
Why in News
UN has warned of starvation related deaths in the Darfur Region of Sudan as people are being forced to eat ‘grass and peanut shells’ due to food scarcity amidst the ongoing civil war.
Recently,violent clashes erupted between the Sudanese Armed Forces (SAF) and the paramilitary Rapid Support Forces (RSF) in Sudan, resulting in the displacement of more than 8.6 million people, including internally displaced people (IDPs), asylum seekers and refugees.
About the Darfur Region
It is a region in western Sudan. The has been an ongoing civil war between the Arab and African communities. This has led to widespread violence and human rights abuses.
Source- Copyright infringement not intended About Sudan
Location Sudan is located in Northeast Africa. Borders of Sudan It borders the Central African Republic to the southwest, Chad to the west, Egypt to the north, Eritrea to the northeast, Ethiopia to the southeast, Libya to the northwest, South Sudan to the south, and the Red Sea. Geographical Area It was the largest country by area in Africa and the Arab League until the secession of South Sudan in 2011. UPSC Syllabus- Geography (Places in News)
Indian ocean is increasingly getting Warmer
April 30, 2024↓Source-This post on Indian ocean is increasingly getting Warmer is based on the article “Warming of Indian Ocean to accelerate: IITM study” published in “The Hindu” on 29th March 2024.
Why in the News?
As per the study, from 1950-2020, the Indian Ocean had become warmer by 1.2°C and climate models expect it to heat up a further 1.7°C–3.8°C from 2020–2100.
Findings of the study
Source: The Tribune Increase in the Overall heat content of the Indian Ocean: There has been elevation in the overall heat content of the Indian Ocean, as the heat penetrates beyond the surface and heats deeper layers. Currently, the heat content is rising at 4.5 zetta-joules per decade. The future projections suggest an increase in the heat content to 16–22 zetta-joules per decade.
Impact of the Increased Heating of the Indian Ocean
1. Rising sea levels: In the Indian Ocean, thermal expansion alone accounts for more than half of the sea-level rise. This surpasses the effects of glacier and sea-ice melting combined.
2. Disruption of Indian monsoon: Projections suggest a 66% rise in extreme dipole events which can lead to deficient Indian Monsoon.
3. Induce marine heatwaves- This heating of the Indian ocean can give rise to near-permanent marine heatwaves.
Marine Heatwaves
A marine heat wave is a coherent area of extreme warm sea surface temperature that persists for days to months. Marine heatwaves are caused by an increase in the heat content of oceans.
UPSC Syllabus: Environment, Geography
Mount Erebus
April 23, 2024↓Source-This post on Mount Erebus has been created based on the article “Home News
It’s Raining GOLD Worth $6000 Everyday In Antarctica From Mount Erebus, Watch Video” published in “India.com” on 21 April 2024.Why in the news?
Mount Erebus, an active volcano in Antarctica, has been in the news for emitting gold dust valued at $6000 daily.
About Mount Erebus
Source-Wikipedia Description-It is the most southerly active volcano on Earth. It was discovered in 1841 by the British explorer Sir James Clark Ross, who named it after his ship, the Erebus.
Location-It is situated on Ross Island, Antarctica.
Type of volcano-It’s a stratovolcano that is characterized by a conical shape and layers of hardened lava, tephra, and volcanic ash.
Lava lake-It is known for its persistent lava lake. The lake has been active since at least 1972 and is one of only a few long-lived lava lakes on Earth.
Frequency of eruption-It constantly churns and occasionally spews bombs of molten rock in Strombolian eruptions. It is being monitored by satellites, primarily because of its remote location.
What is a Stratovolcano?
Description-It is a tall, steep, and cone-shaped type of volcano. Unlike flat shield volcanoes, they have higher peaks. At the top, stratovolcanoes usually have a small crater. It may hold water, ice, or even a volcanic dome when it’s not very active.
Location-They’re usually found above subduction zones and are part of big, volcanic areas like the Ring of Fire around much of the Pacific Ocean.
Type of lava-Strata Volcanoes make up about 60% of the Earth’s volcanoes. They mostly erupt with andesite and dacite, which are cooler and viscous lavas compared to basalt.
These more viscous lavas allow gas pressures to build up to high levels. Therefore, these volcanoes often suffer explosive eruptions.NOTE-Strombolian eruptions
1) They are moderately explosive eruptions of basaltic magma with moderate gas content.
2) They consist of intermittent, discrete explosive bursts which eject pyroclasts as high as hundreds of feet into the air in firework-like incandescent rooster-tails. Strombolian eruptions are louder than Hawaiian eruptions, and generally are of more viscous magma.
Read more-Volcanic Vortex Rings
UPSC Syllabus-Geography in news
Ringwoodite
April 22, 2024↓Source-This post on Ringwoodite has been created based on the article “Gigantic Ocean Discovered 700 km Below Earth’s Surface, Holds Three Times More Water Than All Oceans Combined” published in “Agriculture World” on 17 April 2024.
Why in the news?
Scientists have recently discovered a hidden ocean which is 700 km below earth’s Surface. The ocean is located within a mineral called ringwoodite.
About Ringwoodite
Source-Agriculture World Description-It is a fascinating mineral that exists in the Earth’s transition zone.
Formation-It is a rare type of mineral that forms from olivine under very high pressures and temperatures. The heavy weight of rocks hundreds of kilometers thick and extremely high temperatures above 1,000 degrees Celsius (1,832 Fahrenheit) break down water into its components.
Properties-
1) This mineral has a special crystal structure that can soak up water and hydrogen, like a sponge. It can hold a lot of water.2) When these water-containing minerals reach specific depths, they break down through dehydration, releasing the water to create magmas. Such “dehydration melting” is common in the shallow mantle and forms the source for magmas in many volcanoes.
What is the significance of this discovery?
1) This ocean is much larger than all the surface oceans combined. Its size raises questions about current theories on the source of earth’s water and suggests new inquiries into the planet’s formation and development.
2) This finding strongly suggests that Earth’s water might have come from deep within the planet. With the passage of time, it slowly leaked out from the core, explaining why earth has so much water.
3) This internal water source could also play a role in volcanic activity and the formation of new crust.
Read more-Critical minerals
UPSC Syllabus-Geography in news.
Salas y Gómez
April 22, 2024↓Source-This post on Salas y Gómez has been created based on the article “Scientists find ‘pristine’ ocean mountain range with 50 unknown species” published in “The Indian Express” on 17 April 2024.
Why in the news?
Scientists have recently discovered 160 marine species while exploring the Salas y Gómez region.
About Salas y Gómez
Source-ResercgGate Introduction-It is an underwater mountain chain.
Location-It is in the Southeastern Pacific Ocean. It stretches from west to east. Its west side meets the East Pacific Rise within Chilean waters, near Easter Island, and its east side connects to the western end of the Nazca Ridge.
Ecosystems-Ecosystems in this region are isolated by the Atacama Trench, the Humboldt Current System, and an extreme oxygen minimum zone.
What is the significance of this region?
1) It hosts unique biodiversity with some of the highest levels of marine endemism on Earth.
2) It is under consideration for being designated as a high seas marine protected area once the UN High Seas Treaty is approved.
About United Nations High Seas Treaty
Description-It is known as the Paris Agreement for the Ocean. It deals with Biodiversity Beyond National Jurisdiction.
Mandate-The proposed treaty deals with the ocean beyond the Exclusive Economic Zones (EEZ), which extend from a country’s coast to about 200 nautical miles into the sea. (Countries have special rights for exploration up to 200 nautical miles.)
India-It has not signed the treaty.
Read more-The UN High Seas Treaty: challenges and significance
NOTE-Exclusive Economic Zone
It is an area of the ocean that extends up to 200 nautical miles (370 km) immediately offshore from a country’s land coast. In this area, the country retains exclusive rights to the exploration and exploitation of natural resources.UPSC Syllabus-Geography in news.
Mount Ruang
April 20, 2024↓Source– This post on Mount Ruang is based on the article “Indonesia’s Ruang mountain spews fiery lava thousands of feet into the night sky; tsunami alert raised” published in “The Times of India” on 19th April 2024.
Why in the News?
Recently, Mount Ruang began erupting, sending an ash cloud more than a mile high into the sky.
About Mount Ruang
Source: CNN World 1. Mount Ruang is a stratovolcano located on Ruang Island, North Sulawesi.
2. Ruang Volcano towers at 725 meters (2,400 feet) high. Its summit reaches 10,932 feet above sea level and features a caldera approximately two miles wide.
About stratovolcano
1. Stratovolcanoes are tall, steep, and cone-shaped, differ from the flatter shield volcanoes by having higher peaks.
2. They are primarily located above subduction zones and are a major part of extensive volcanically active areas like the Pacific Ring of Fire.
3. Stratovolcanoes account for about 60% of the Earth’s individual volcanoes and are mostly known for erupting andesite and dacite lavas.
These lavas are cooler and more viscous compared to basalt, allowing gas pressures to build significantly and often leading to explosive eruptions.
4. These volcanoes typically consist of an equal mix of lava and pyroclastic material. The layering of these materials is why they are also commonly referred to as composite volcanoes.
6. Stratovolcanoes usually feature a small crater, which may be filled with water or ice, or contain a volcanic dome when the volcano is not actively erupting.
UPSC Syllabus: World geography
Lake Kariba
April 17, 2024↓Source– This post on Lake Kariba is based on the article “El Nino drought leaves Zimbabwe’s Lake Kariba only 13% full: A disaster for people & wildlife” published in “Down to Earth” on 16th April 2024.
Why in the News?
Due to the latest El Nino drought, water levels at Lake Kariba in Zimbabwe have dropped dramatically.
About Lake Kariba
Source: victoriafall guide 1. It is the world’s largest man-made lake and reservoir by volume.
2. It lies approximately 1,300 kilometres upstream from the Indian Ocean, along the border between Zambia and Zimbabwe.
3. The Kariba dam is a double curvature concrete arch dam in the Kariba gorge of the Zambezi river basin between Zambia and Zimbabwe.
4. The wall spans the Kariba Gorge, forming a boundary between Zambia and Zimbabwe.
5. The dam generates substantial electricity for both Zambia and Zimbabwe and bolsters a robust commercial fishing industry.
6. Lake Kariba and its shores host a diverse array of bird species, such as fish eagles and cormorants, often seen hunting along the shoreline.
The lake also draws elephants and other big game for hydration, creating spectacular scenes of these animals at the water’s edge and bathing in the shallows.
Read more: El nino and its impact
UPSC Syllabus: World Geography
