A glacier is a thick mass of ice that originates in the earth's surface by accumulation, compaction and recrystallization of the snow, showing evidence of past or present flow. Its existence is possible when the annual precipitation of snow exceeds that evaporated in summer, which is why most of it is located near the poles, although they exist in other areas, in mountains. The process of the growth and establishment of the glacier is called glaciation. The glaciers of the world are varied and can be classified according to their shape (valley, niche, ice field, etc.), climatic regime (tropical, temperate or polar) or thermal conditions (cold basis, hot or politermal basis).
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