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7 Cards in this Set

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