Earth's Ice Ages

Earth has had several "ice ages." Ice ages were times when glaciers covered large parts of the Earth's land. Ice ages lasted for tens of thousands of years. Temperatures were much colder than normal. Huge ice sheets covered large parts of the continents. Some of the northern oceans were solid ice. Some land was exposed that is now covered with water. Where the Bering Sea lies today between Russia and Alaska was a "land bridge" that joined North America and Asia.

The most recent ice age began about seventy thousand years ago. The Earth was much colder than it is now. .....

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