Mountains
Black ice on rocks in the mountains is known as verglas (glaze ice), and is a great hazard for climbers and scramblers. Cold weather is common at high altitudes, and black ice quickly forms on rock surfaces. Loss of traction is as sudden and unexpected as on a pavement or road, but can be fatal if the rock is in an exposed position with a drop below. The ice-axe and crampons are of little use in such circumstances, a belay rope being the only protection which can prevent a fall.
Read more about this topic: Black Ice
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