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The Great lakes went through glaciation many thousands of years ago.
Glaciation
The Great Lakes are more the result of glaciation than plate tectonics.
Glaciation created a rolling landscape on the Great Lakes portion of the lowlands
Among its many influences, glaciation formed the Great Lakes and Long Island (NY state).
The Canadian Shield
An extensive, late Paleozoic glaciation affected southern India, southern Africa and southeastern South America.
The Great Lakes and the Finger Lakes were carved by ice glaciation in the valleys. Lakes in Minnesota and Wisconsin were gouged out by glaciers and later filled with water from melting glaciers. Niagara falls was formed when the glaciers created dams on the rivers and changed the flow.
The Canadian shield
Glaciers changed the face of North America with the following effects:An ice sheet covered most of Canada.The southwest received heavy rains.
mississippi floodplain region
yes. winds coming in over the lakes chill because of the cold water, southern winds aren't really affected.