I understand that the Great Lakes were formed by the glacial terminus of one of the Ice Ages. What I don’t understand is the extreme depth of Superior, Huron and Michigan. These lakes are over 500 ft deep, even over 1000 ft deep, which seems fantastical based on their other dimensions.
In comparison, Long Island and the Sound were also formed by a glacial terminus, and the Sound is only about 230 ft deep.
I’m having trouble visualizing how glaciers slowly spreading down from the north would leave a deep scar at the terminus. I would expect a large pile of agglomerate (like Long Island), not a deep scar.
What gives?
In: Other
If all the ground was of the same density would be evenly eroded. But the ground isn’t. Different areas of the earth have different density to some areas take less effort to be worn away then areas with higher density materials. Not to mention that even before the ice ages earth was never a perfectly smooth ball to begin with so areas always had different depths to start with.
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