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Alteration of any part of the earth's surface by passage of a glacier, chiefly by glacial erosion or deposition.
The transformation of cloud particles from waterdrops to ice crystals, as in the upper portion of a cumulonimbus cloud.



(1) All of the long-term natural ice, primarily glaciers—for example, mountain glaciation in the Caucasus and the Pamirs or continental glaciation in Antarctica and Greenland.

(2) The process of significant expansion of glaciers brought about by a change in climate.