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Encyclopedic overview
Ice ages, long periods of reduction in the temperature of the Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers. Earth's climate alternates between ice ages and greenhouse periods, during which there are no glaciers on the planet.
North America Greenland ice sheet
Excerpted from Wikipedia’s “Category:Ice ages” article, available under the CC BY-SA 4.0 licence.