Who deduced that large continental glaciers once covered much of the Earth's land surface?

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Louis Agassiz, a Swiss geologist and naturalist, studied the rocks, glaciers, and fossils of the Swiss Alps and deduced that they were once covered by an enormous ice sheet. He later applied his findings to other regions, including North America, and proposed that large continental glaciers once covered much of the Earth's land surface.

Who Deduced That Large Continental Glaciers Once Covered Much of the Earth's