Avalanches usually form when changes in the surface of the snow occur. When the snow shifts even just slightly it will start a chain reaction and the snow will slide down a mountain side.-http://www.ussartf.org/avalanches.htm
Avalanches can happened for a few reasons. They can happen from loud noises or from people walking around on the loose snow. You should always be careful not to make loud noises.-http://www.ask.com/question/how-do-avalanches-happen
Avalanches are disastrous natural forces, made of swiftly flowing snow, ice, and rock that guarantee annihilation for any human settlements in their way. They are caused by atypical precipitation, glacier debris or any form of external stress on compact snow
Read more at http://www.environmentalgraffiti.com/mountains/news-10-worst-avalanches-history?image=0#2yvqcKQ35wkwSzEG.99 - the steeper the mountain the faster the velocity of the avalanche.
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