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Ice Ages
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Ice Ages Pleistocene 3 M.y. Permian 250-220 M.y. Ordovician 450 M.y. Precambrian 900-650 M.y. (Snowball Earth) 2300 M.y.
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High School
-Social Sciences
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By
Roswell Roy
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Tags: Ice Ages , Pleistocene 3 M.y. , Permian 250-220 M.y. , Ordovician 450 M.y. , Precambrian , 900-650 M.y. (Snowball Earth) , 2300 M.y. , Milankovich Cycles , Cool Summers Important Cold Winters , Tilt Axis , Shape Orbit , Precession , Can’t whole story-have operated throughout earth history
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