Glacier photos. When the climate cooled… Ice advanced over the land, moving southward from Canada over the Great Lakes Region.

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Presentation transcript:

Glacier photos

When the climate cooled… Ice advanced over the land, moving southward from Canada over the Great Lakes Region.

What would form here?

Erratics along Lake Michigan Shoreline

Lake Superior Shoreline

Glacial polish

Kelly’s Island Glacial grooves

Name this glacial landform

How did these lakes form?

Kettle Lakes Kettle lakes form when blocks of ice break off the front edge of a glacier, become buried by sediment. The ice melts leaving a hole which fills with water creating a lake.

Isostatic rebound Pictured Rocks

Pictured Rocks

Each of the Great Lakes began as a river. Image from Earth Science, Tarbuck and Lutgens, 2003

As the climate cooled… The rivers froze. Glaciers moved through them – widening and deepening them to form today’s lake bottoms.

The sediment removed from the river valleys was deposited in the moraines covering our state. This is why the moraines run parallel to the shorelines of the Great Lakes.

When the climate began to warm, the glaciers began to melt and retreat.

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