What caused virtually all of canada and some of the northern united states to be once covered by thick glacial ice almost 15,000 years ago? question 13 options: changes in the earth's climate caused ice sheets to grow. changes in the orbit of the earth caused 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.

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16-09-2022
Geography

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What caused virtually all of canada and some of the northern united states to be once covered by thick glacial ice almost 15,000 years ago? question 13 options: changes in the earth's climate caused ice sheets to grow. changes in the orbit of the earth caused 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.

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camipaterson camipaterson · Answer 1 · 2022-09-22T06:37:52-04:00

What caused virtually all of Canada and some of the Northern United States to be once covered by thick glacial ice, is the first option: "changes in Earth's climate caused ice sheets to grow".

During the last glacial era, there was a general decrease in temperature all around the world. This made the ice sheets and glaciers in the poles extend. The original causes of these changes in temperature are still under debate.

In the case of North America, the Arctic ice layer and Ice sea expanded toward most of Canada and part of the United States. During this period, the Great Lakes and lakes from northern parts of the USA were formed out of glaciers' movements and drainage.

You can learn more about the glacial era in the link below:

https://brainly.com/question/12916542

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