< Snow

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Much of the earths fresh water is held by gigantic glaciers in the north and south poles, formed by falling snow over milennia.

There's a different between glaciers, ice fields, and polar caps. Are we sure that caps are formed from falling snow? I was under the impression that Antarctica got almost no precipitation at all, and the ice sheet expanded and contracted by simple melting and freezing.

The ice caps are formed from falling snow. Almost no precipitation is not equal to no precipitation at all; if it never gets above freezing, it will eventually accumulate no matter how little falls. -- Paul Drye