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19 Cards in this Set
- Front
- Back
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What was the name given to the last ice age? |
Wisconsin Ice Age |
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What is the name of the ice sheet that covered the Great Lakes region during the last ice age? |
Laurentide Ice Sheet |
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About how many years ago did ice cover the northern half of America? |
15,000 |
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How thick was the ice sheet? |
8-10 thousand feet thick |
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Once the climate began to warm up how long did it take the ice sheet to melt? |
10,000 |
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What causes a glacier to move? |
Weight of the thicker ice in the north pushes down on causing the thinner ice in front of it to move from the south |
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Why does the bottom of a glacier move slower than the top of the glacier? |
Because its going across the ground and pushing everything away, so it takes a while to move. |
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Explain how the glacier carves out the soft materials of the earth. |
Weight of the glaciers pushes out the soft material from the earth |
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What is the name given to the soft material carved of the earth's surface by a glacier? |
Till |
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What is created by the soft material when the glacier melts and retreats? |
Ridges |
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Describe a glacial valley and how they are created |
Trough like, steep near vertical cliffs where entire mountainsides were scoured by glacial movement. |
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What is a glacial fjord? |
Glacial valley that forms near the ocean, ice melts and retreats exposing valley to sea water. Creates a long narrow inlet filled with sea water. |
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What is a glacial lake? |
Hole carved out by glacier then melted to fill hole with water |
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How long ago did the ice sheet begin to melt |
14,000 |
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Which of the great Lakes was first to appear once the ice sheet began melting? |
Lake Michigan, Huron, and Erie |
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Where did the melt water from first forming Great Lakes drain to? |
The Mississippi river |
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What was created by the draining of the first forming Great Lakes? |
Ohio River Valley |
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How long ago did lake superior begin to form? |
11,000 |
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Where did the melt water from the newly forming Lake Superior flow to? |
Mississippi River |
