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An avalanche occurs whenever the pull of gravity on a snow mass is sufficient to overcome anchorage or internal cohesion. To determine the probability of an avalanche on any suspected slope the skier should consider the following factors:
1) Steepness of slope.
2) Shape of slope.
3) Anchorage to ground surface and bond between
snow layers.
4) Possible existence of a buried snow slab.
5) Internal cohesion of visible and buried snow layers.
6) Recent weather as affecting the last three factors.
7) Evidence of prior avalanches.
8) Depth of snow.
Related terms include lake tahoe skiing and wyoming skiing.
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