Geography 2011A/B Study Guide - Midterm Guide: Y Chromosome, Semen Analysis, Male Reproductive System
17 Dec 2016
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The ice age formed the great lakes: whi(cid:272)h is a pe(cid:396)iod of the ea(cid:396)th"s geologi(cid:272) histo(cid:396)y (cid:449)he(cid:374) (cid:373)u(cid:272)h of the. Northern hemisphere was covered by ice: the overall climate was 15 degrees less than it is today. Most regent ice age: pleistocene epoch. Occurred between ten thousand and 1. 6 million years ago. At least four times during this ice age glaciers (large masses of ice) retreated over north america. Laurentide: last major glacier, formed around one hundred thousand years ago. Reached its peak eighteen thousand years ago. Covered almost all of canada and the us. Which is when giant sheets of ice flow across the land and level out the mountains and create massive valleys. Melting of laurentide: occurred around fourteen thousand years ago. Evidence of receding glaciers: left land formations. Which can be seen in the canadian shield, niagara escarpment,
