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Welcome to Sunya IAS, a trusted source for in-depth analysis of UPSC Static and Current Affairs coverage.
In this video, we…
Welcome to Sunya IAS, a trusted source for in-depth analysis of UPSC Static and Current Affairs coverage.
In this video, we…
■ TRANS - HIMALAYAS
#Himalayanranges
◇ Lies immediately north of Great himalayan ranges.
◇ also known as Tibetan Himalaya because lies in Tibet.
◇ Average elevation - 3000m.
◇ Average width - 40km in extremities and about 225km in Central part.
◇ Distance of about 1000km in east - west direction.
◇ This contain Tethys sediments. Rocks of this region contain fossil marine sediments but underlain by Tetitiary granite.
◇ The Zaskar, Ladakh, Kailash and Karakoram are main ranges.
◇ K2 lies here.
▪︎@upsc_geography_notes
#Himalayanranges
◇ Lies immediately north of Great himalayan ranges.
◇ also known as Tibetan Himalaya because lies in Tibet.
◇ Average elevation - 3000m.
◇ Average width - 40km in extremities and about 225km in Central part.
◇ Distance of about 1000km in east - west direction.
◇ This contain Tethys sediments. Rocks of this region contain fossil marine sediments but underlain by Tetitiary granite.
◇ The Zaskar, Ladakh, Kailash and Karakoram are main ranges.
◇ K2 lies here.
▪︎@upsc_geography_notes
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■ SOURCES OF INFORMATION ABOUT THE INTERIOR. [ PART 1]
#interiorofearth
□ DIRECT SOURCES
◇ Deep earth mining and drilling reveal the nature of rocks deep down the surface.
◇ But as mining and drilling are not practically possible beyond a certain depth, they don’t reveal much information about the earth’s interior.
◇ Mponeng gold mine (deepest mine in the world) and TauTona gold mine (second deepest mine in the world) in South Africa are deepest mines reaching to a depth of only 3.9 km.
◇ And the deepest drilling is only about 12 km deep hole bored by the Soviet Union in the 1970s over the Kola Peninsula.
◇ Volcanic eruption forms another source of obtaining direct information.
▪︎@upsc_geography_notes
#interiorofearth
□ DIRECT SOURCES
◇ Deep earth mining and drilling reveal the nature of rocks deep down the surface.
◇ But as mining and drilling are not practically possible beyond a certain depth, they don’t reveal much information about the earth’s interior.
◇ Mponeng gold mine (deepest mine in the world) and TauTona gold mine (second deepest mine in the world) in South Africa are deepest mines reaching to a depth of only 3.9 km.
◇ And the deepest drilling is only about 12 km deep hole bored by the Soviet Union in the 1970s over the Kola Peninsula.
◇ Volcanic eruption forms another source of obtaining direct information.
▪︎@upsc_geography_notes
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■ SOURCES OF INFORMATION ABOUT THE INTERIOR. [ PART 2]
#interiorofearth
INDIRECT SOURCES.
□ Seismic waves
◇ They are the most important source available to understand the layered structure of the earth.
◇ The velocity of seismic waves changes as they travel through materials with different elasticity and density.
□ Meteorites
◇ Meteorites and Earth are born from the same nebular cloud. Thus, they are likely to have a similar internal structure.
□ Gravitation
◇ The gravitation force (g) is not the same at different latitudes on the surface. It is greater near the poles and less at the equator.
◇ This is because of the distance from the centre at the equator being greater than that at the poles.
◇ The gravity values also differ according to the mass of material.
□ Magnetic field
◇ The geodynamo effect helps scientists understand what's happening inside the Earth's core.
◇ Shifts in the magnetic field also provide clues to the inaccessible iron core.
▪︎@upsc_geography_notes
#interiorofearth
INDIRECT SOURCES.
□ Seismic waves
◇ They are the most important source available to understand the layered structure of the earth.
◇ The velocity of seismic waves changes as they travel through materials with different elasticity and density.
□ Meteorites
◇ Meteorites and Earth are born from the same nebular cloud. Thus, they are likely to have a similar internal structure.
□ Gravitation
◇ The gravitation force (g) is not the same at different latitudes on the surface. It is greater near the poles and less at the equator.
◇ This is because of the distance from the centre at the equator being greater than that at the poles.
◇ The gravity values also differ according to the mass of material.
□ Magnetic field
◇ The geodynamo effect helps scientists understand what's happening inside the Earth's core.
◇ Shifts in the magnetic field also provide clues to the inaccessible iron core.
▪︎@upsc_geography_notes
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