Laurentide ice sheet

• What is an ice sheet

  Large accumulations of ice that bury the landscape they extend for over 50,000 km and are very thick
• Where did the LIS cover

  Canada, Hudson Bay, Great lakes
• When did the LIS exist

  21,000 years ago.
• How thick was the ice sheet

  2-3km
• What area did the LIS cover

  13 million square km
• Name one ice dome from the LIS

  Labrador dome - 3km thick
• What did the LIS do to mountains

  Wore down many mountains so that highest peaks are now only 500-700m.
• What are ellipsoidal basins

  Huge lake basins created by erosion where the ice sheet gouged out deep depressions in the bedrock.
• What was created due to ellipsoidal basins

  Hudson Bay .
• What are the great lakes

  5 big lakes

  Lake Huron

  Lake Ontario

  Lake Michigan

  Lake Erie

  lake superior
• HOMES?

  Huron

  ontario

  Michigan

  Erie

  superior
• What formed the Great Lakes

  Ice lobes. tongue shaped glaciers extending for the ice sheet that move back and forth.
• What is the geology of the Great Lakes area

  shale, granite and limestone.
• Which rock type is most resistant

  Granite - interlocking grains of minerals
• What is the Canadian Shield

  Very hard resistant rock that is more resistant to weathering.
• What are striations

  Scratches on surfaces of rock due to the subglacial debris.
• What are mega scale lineations

  Valley like features that are caused by ice streams
• Name one example of till found from the LIS

  Alexandria moraine formed by the wadena lobe. Red and sandy
• How long is the Alexandria moraine

  400km
• Where can drumlins be found

  At the bottom of Lake Michigan
• Named example of erratics

  Three maidens in Minnesota. Travelled 90 miles
• What is a pro glacial lake

  Body of water impounded infront of a glacier
• How does geology influence geomorphic processes

  Alternating bands of rock means that shale eroded and left the Great Lakes whereas the Canadian Shield of granite wasn’t eroded.
• How does climate influence geomorphic processes

  Depth of ice was thicker in cooler places, Labrador lobe created Hudson Bay.