Glacier begin to from when more snow falls during the winter than melts and evaporates in summer. The excess snow gradually builds up in layer. its increasing weight causes the snow crystals under the surface to
become compact, grain-like pellets called firn. at depths of 50 feet (15 m) or more, the firn is further compressed into dense crystals of glacial ice. The ice eventually becomes so thick that its moves under the pressure of its own great weight.
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