A hard snow surface lying upon a softer layer; crust may be formed by sun, rain or wind, and is described as a breakable crust or unbreakable crust, depending upon whether it will break under the weight of a turning skier. Examples are wind crusts and slabs, melt-freeze crusts as well as sun and rain crusts. Melt-freeze-crusts can be up to several centimetres thick while sun and rain crusts usually form a thin, i.e., a few millimetres thick, glaze of ice on the surface.
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