A Closer Look at the Great Lakes – St. Lawrence Lowlands.

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Presentation transcript:

A Closer Look at the Great Lakes – St. Lawrence Lowlands

The Landforms of our region were basically formed by glaciers during the last ice age The Glacial period ended ~ years ago How do we know it was a glacier? They Leave tracks! Glaciers create unique landforms from sediment and erosion patterns. They also carry rocks of all sizes for great distances eg. Many of the large rocks found around here came from the Canadian Shield

Glacier’s form when snow accumulates year after year without melting The snow compresses and forms ice When the ice is ~ 20 m thick it begins to slowly flow under the force of its own weight As the ice moves it scraps the land and picks up rocks and sediment

The Great Lakes started to form years agoThe Great Lakes started to form years ago years ago the glaciers started to melt and retreat north years ago the glaciers started to melt and retreat north As they retreated they scraped giant low spots in the land and melted ice filled in the holesAs they retreated they scraped giant low spots in the land and melted ice filled in the holes years ago Lake Superior, Michigan and Huron were all one lake years ago Lake Superior, Michigan and Huron were all one lake By years ago all of the lakes had formedBy years ago all of the lakes had formed

Many areas of the Great Lakes Lowland have very fertile soil This is great for growing crops Other areas are dominated by clay soil (especially lambton county)

The major landform feature of the Great Lakes Lowlands is the Niagara Escarpment This is a rocky ridge that runs from Niagara Falls to Manitoulin Island

The Niagara Escarpment