How long ago since the Great Lakes were covered in glaciers?

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Started by metmike - April 8, 2019, 4:09 p.m.

When did the depiction below exist?

How The Great Lakes Were Formed - The Awesome Mitten

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By metmike - April 8, 2019, 4:11 p.m.

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Bonus question:

What would average crop yeilds for corn be with today's technology under similar conditions?

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