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Eldredge and Biek Imagine a time long ago where the earth was once so cold that in its entirety it was covered by ice. In the earths 4.6 billion year history it is commonly believed that the earth has suffered to the dramatic effects of 5 ice ages (Eldredge and Biek). The causes of these.
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Course Of Their 220-Year HistoryDrop StonesPleistocene Ice AgesScientific World