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What caused virtually all of canada and some of the northern us to be once covered by thick glacial ice almoat 15000 years ago

What caused virtually all of canada and some of the northern us to be once covered by thick glacial ice almoat 15000 years ago
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What caused virtually all of canada and some of the northern us to be once covered by thick glacial ice almoat 15000 years ago

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User Lorrie
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Changes in the orbit of the earth caused the ice sheets to spread across Canada. 
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User Chamila Maddumage
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