What created the great lakes? earthquake glaciers rivers foldingpls

Glaciers

The Laurentian Great Lakes were formed nearly 20,000 years ago as retreating ice sheets exposed the basins they had carved into the land which then filled with melt water. The glacier, up to 2 miles thick, was so heavy and powerful it gouged out the earth's surface to create the lake basins.

answer (a) more rain in u s and less rain in australia and asia