Time trip.

Current Events, a Weekly Reader publication | December 17, 2004 | Copyright

This isn't the first time Earth's temperature has gone to extremes. During the ice ages millions of years ago, gigantic glaciers covered much of the planet.

The most recent Ice Age, known as the Pleistocene Epoch, began more than a million years ago. The epoch was divided into glacial stages and interglacial stages, when milder climates prevailed.

During glacial stages, seawater froze into glaciers, lowering the ocean levels by as much as 490 feet. Glaciers several thousand feet thick in some places spread across northern North America, Europe, and Asia, ...

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