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Shri Ashtapad Maha Tirth - II
The Recent Ice Age in Asia
Eurasian Ice Sheet
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The most recent Ice Age began 3.25 million years ago, in a period when the plateau also began rising rapidly. This combination of events increased the severity of the Ice Age climate in Tibet. Across the world, steppe and desert replaced forests during the glacial periods, but trees and vegetation returned during the warmer inter-glacials. In Tibet, once the plateau had risen, the cool, dry climate could not support widespread forestland, and steppeland increased.
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Causes of the Ice Age
sun
ORBITAL VARIATION
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PRECESSION TILT VARIATION
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The most recent Ice Age seems to be related to cyclical variations in the orbit of the earth around the sun, to changes in the degree of tilting of the earth's axis, and to changes in gyration of the axis known as precession. Glaciation is favored by cool summers and mild winters, which occur when the orbital is more oval than round, when the axis is less tilted, and when the closest approach to the sun falls in the winter. It is not yet clear whether earlier ice ages fit these cycles.
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Bering
Strait
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camels
vaks
EUROPE
Animal Migrations After Africa joined Asia 20 million years ago, animals began traveling between the two continents. Later migrations between Asia and the Americas also took place during the Ice Age when sea level dropped, and a land bridge appeared across the Bering Strait.
noths antelopes
cats
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NORTH AMERICA
ASIA
pigs.
PACIFIC OCEAN
TO
AFRICA
SOUTH AMERICA
AUSTRALIA
Ancient Tibet
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