[Answer] What created the Great Lakes?

Step 1 : Introduction to the question "What created the Great Lakes?"

...During the peak of the last ice age, about 20,000 years ago, an enormous, mile-thick glacier known as the Laurentide ice sheet covered most of Canada and the northern U.S. Over time, the massive weight and movement of the glacier carved giant lake basins into the earth. Then, when the climate warmed and the ice melted, water filled these basins, creating the Great Lakes. They continued to shift and evolve until reaching their present forms about 3,000 years ago.

Step 2 : Answer to the question "What created the Great Lakes?"

Glaciers:

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