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

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