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Avalanche - Wikipedia, the free encyclopedia |
 | | An avalanche is a very large slide of snow (or rock) down a mountainside, caused when a buildup of snow is released down a slope, and is one of the major dangers faced in the mountains in winter. |
 | | Avalanches are often classified by what they are made of, for example snow, ice, rock or soil avalanches. |
 | | Avalanches occur when the load on the upper snow layers exceeds the bonding forces of a mass of snow (bonding to layer beneath, horizontal internal stability, support from anchors such as rocks and trees, stress support from top or bottom of slope). |
| en.wikipedia.org /wiki/Avalanche (3825 words) |
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