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from Wikipedia, the free encyclopedia

Geologic temperature record

This article is devoted to temperature changes in Earth's environment as determined from geologic evidence on multi-million to billion (109) year time scales.

The last 3 million years have been characterized by cycles of glacials and interglacials within a gradually deepening ice age.

Note:   The above text is excerpted from the Wikipedia article "Geologic temperature record", which has been released under the GNU Free Documentation License.
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October 26, 2016

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