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USGS CMG InfoBank: Glaciers

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Comment: 02:33 - 03:27 (00:54)
Source: Annenberg/CPB Resources - Earth Revealed 23. Glaciers
Keywords: "James Zumberge", glacier, snow, ice, temperature, polar, Equator, mountain, "high elevation", precipitation, season, climate

Our transcription: Glaciers are large, long-lasting masses of ice which slowly flow across the land.
While most places from time to time have temperatures cold enough for snow and ice to form, only in a few of these places do conditions permit the growth of glaciers.
Glaciers come from the accumulation of snow, either in polar regions, or in high altitudes, or even at the Equator at very high elevations on the tops of mountains.
So wherever you have precipitation that falls in the form of snow, you can get a glacier.
And there's one other requirement, and that is that more snow has to fall in the winter than melts in the summer, so that in every twelve-month period, some of the previous winter's snowfall is left over.

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