What caused virtually all of canada and some of the northern us to be once covered by thick glacial ice almost 15,000 years ago? question 4 options: changes in the earth's climate caused the ice sheets to grow. changes in the orbit of the earth caused the ice sheets to spread across canada. the ice sheets were widespread because they were prevalent all around the world. there is no apparent reason why the glacial ice was present. save
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What caused virtually all of canada and some of the northern us to be once covered by thick glacial...
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