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7 Cards in this Set
- Front
- Back
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glacers
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advanced and retreated
reached as far as Southern Illinois |
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sea level was
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330 ft lower than today
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Coldest portion of the Pleistocene era
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average air temp. was 22 degress colder
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ice ages can las up to
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90,000
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how many ice ages took place during the Pleistocene era?
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18
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was much cooler and
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rainier
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deeply buried ice tells us
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how the atmosphere was roughly 250,000 million years age
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