Nature
4
About 10,000 years ago, glacial ice covered the North Shore and caused the earth to sag. When the ice melted, the removal of that great weight began the land's rise, or uplift. Uplift, together with falling lake levels, left former shorelines inland. It also forced all North Shore rivers to cut through rock to reach the receding Lake Superior, creating the falls, rapids, and gorges seen today. Differential uplift tilted old shorelines.
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