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Glaciers swelled and shrank in cycles tens of thousands of years long, altering the climate and shifting the ranges of forests and grasslands. Melting ice flooded its own gouged-out basins, making great lakes and rivers.
Huge ice caps cover Earth's polar regions today.
These ice caps strongly affect worldwide climate.
Ice caps grow and shrink in cycles--they're about to start growing again!
Get the inside story on mammoths and other Ice Age animals.
What's happened to Ice Age life and climate
Find out about early human evolution - visit the lab!
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