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USGS CMG InfoBank: Age of Ice

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Comment: 20:38 - 21:09 (00:31)
Source: Annenberg/CPB Resources - Earth Revealed 23. Glaciers
Keywords: Greenland, "ice core", drilling, "geologic age", season, "carbon-14 dating", glacier, "glacial ice", "Greenland Ice Core Program"

Our transcription: The cores from Greenland date back over 100,000 years.
The age of the ice is determined by counting bands which form seasonally.
High-density ice bands are typical of winter months; low density of summer.
In deep ice the bands are compressed together making them impossible to see, so chemical methods including Carbon-14 dating are used instead to determine the age of the ice.

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