Superior, Michigan, Huron, Erie, Ontario. These are the Great Lakes that make up the world's largest freshwater system. But how did they come to be? The answer lies with glacial scouring and isostatic rebound. The Niagara Escarpment is also an interesting feature.

Music: Drunken Sailor

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Sources:
https://www.seagrant.wisc.edu/resourc...
https://www.noaa.gov/education/resour....