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how much sf6 has North America

how much sf6 has North America

North American Glaciation - CliffsNotes North American Glaciation. The last major glaciations in North America during the Pleistocene covered all of Canada and the northern third of the United States. The thickest, central portion of the ice sheet covered Hudson Bay. The ice sheet stripped Canada of its topsoil, scoured and polished bedrock, and gouged out numerous future lake basins

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