Ice Age - Research Article from Environmental Encyclopedia

This encyclopedia article consists of approximately 1 page of information about Ice Age.
This section contains 109 words
(approx. 1 page at 300 words per page)

Ice Age

Ice age usually refers to the Pleistocene epoch, the most recent occurrence of continental glaciation. Beginning several million years ago in Antarctica, it is marked by at least four major advances and retreats (excluding Antarctica). Ice ages occur during times when more snow falls during the winter than is lost by melting, evaporation, and loss of ice chunks in water during the summer. Alternating glacial and interglacial stages are best explained by a combination of Earth's orbital cycles and changes in carbon dioxide levels. These cycles operate on time scales of tens of millennia. By contrast, global warming projections involve decades, a far more imminent concern for humankind.

This section contains 109 words
(approx. 1 page at 300 words per page)
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Environmental Encyclopedia
Ice Age from Environmental Encyclopedia. ©2005-2006 Thomson Gale, a part of the Thomson Corporation. All rights reserved.
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