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BORN OF AN ICE AGE
THE WORLD BEFORE THE ICE ATTACKED
THE BEGINNINGS OF GLACIERS AND MAN
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advance Africa air masses Alaska Alps animals Antarctica Arctic Ocean areas Asia atmosphere basins become began bones boulders Canada cause caves cent changes climate cloud cloud seeding coast colder continue cooling covered deposits drift dust Early earth east environment erosion Europe farther feet forests Geological glacial stage Greenland growing heat Homo erectus Ice Age ice caps ice sheets ice's icebergs increased interglacial irrigation islands lakes land latitudes Laurentide ice sheet layer Little Ice Age living look mammoth man-apes melting meltwater miles mineral moisture moraine mountains moved natural Neanderthals North America northern period places plants Pleistocene polar poles population precipitation reached retreat rivers rock scientists Siberia snow soil southern spread streams summer surface surge surging glaciers temperature Tertiary theory tion tourists trees tropical tundra Upper Paleolithic valley glaciers vegetation volcano warm warmer weather winds winter