| Glacial Ice |
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| q | Ice cores retrieve climate records extending back thousands of years
in small |
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| mountain glaciers to as much as hundreds of thousands of years in
continental |
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| sized ice sheets. |
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| q | The antarctic ice sheet has layers that extend back over 400,000
years. |
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| q | The Greenland ice sheet has layers that extended back 100,000 years. |
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