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Term for ice crystal formation caused by atmospheric moisture. This snow-like coating forms near the ground and on raised objects. Frost also occurs inside snow cover. This can occur through the transformation of snow crystals, i.e. through evaporation in warmer or resublimation (transition of a substance from a gaseous to a solid state of aggregation) in colder snow layers; this is then referred to as deep frost. Hoarfrost, on the other hand, is a solid precipitation that forms from supercooled water droplets of light mist or directly from the water vapour contained in the air by resublimation. This requires a very high relative humidity of over 90% and an air temperature below minus 8 °Celsius. See also precipitation and meteorology.

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