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Past ice ages are believed to have been caused by what?
Past ice ages are believed to have been caused by different combinations of several factors: the concentrations of atmospheric carbon dioxide and methane; Milankovitch cycles; the motion of tectonic plates (affecting weather systems); variations in solar output; the orbital dynamics of the Earth-Moon system; meteorite impacts; and volcanic eruptions.
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Asked 7/13/2010 6:25:36 PM
Updated 9/3/2014 7:48:09 AM
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Edited by jeifunk [9/3/2014 7:48:09 AM]
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Past ice ages are believed to have been caused by different combinations of several factors: the concentrations of atmospheric carbon dioxide and methane; Milankovitch cycles; the motion of tectonic plates (affecting weather systems); variations in solar output; the orbital dynamics of the Earth-Moon system; meteorite impacts; and volcanic eruptions.

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Added 9/3/2014 7:35:40 AM
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