As ice age glaciers have retreated, it caused major transformations of the river channels. Great lakes were formed through glacial erosion. Crustal subsidence and rebound have also occurred. The removal of the large weight of ice sheets caused the rebounding of crust. It resulted in the rising of landmasses. Sea-levels were also affected, it increased as ice sheets melted. Lastly, glaciers can also function as dams, trapping meltwater. This results in the formation of proglacial lakes.
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