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Pleistocene Age
- began~2.5 million years ago
- ended~8,000 years ago
- at least 3 periods of Ice advance
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Laurentide Ice Sheet
The ice sheet that descended over north America during the Pleistocene age
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Knoll
- a convex hill (slope > 3%)
- Plain Landform component
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Swell
a convex hill (slope < 3%).
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Pothole
- any pot-shaped pit or hole not over limestone
- deeper than a closed depression.
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Kettle
Deeper than a pothole
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Sinkhole
- – a depression, commonly funnel-shaped, over limestone
- – it is on a karst plain and its drainage is subterranean
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