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The Chesapeake Bay was formed some 12,000 years ago as the last great ice sheet melted. This caused the sea levels to rise and flood the southern most valley of the Susquehanna River. The Chesapeake Bay was formed some 12,000 years ago as the last great ice sheet melted. This caused the sea levels to rise and flood the southern most valley of the Susquehanna River. haha

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15y ago

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