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How were the Great Lakes formed?

from WorldAtlas

How were the Great Lakes formed? WorldAtlas The chain of five deep, freshwater bodies known as the Great Lakes make up 20 per cent of the world’s surface water supply. In fact, the Great Lakes are so large they are often referred to as inland seas. For thousands of years these lakes have been the source of food, transportation, and drinking water for populations of First Nations, early European settlers, and, today, millions of people in Canada and the United States. But how and when were the lakes Superior, Michigan, Huron, Erie, and Ontario formed? READ MORE

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