The glacier that covered most of North America scarred the land, turned rivers in their courses, and deeply influenced our history
A narrow band of very low, very gentle hills extends across the northern states from Cape Cod to the Rocky Mountains in Montana. In places the winds and rains of thousands of years have worn them down to insignificant undulations; in other places they may be a hundred feet high or more. There is nothing about it to catch the casual eye, but the geologist recognizes this ridge as the terminal moraine of North America’s last continental glacier, the line where the ice ended its long advance and began to melt back.
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