http://www.youtube.com/watch?v=B0RWLxOFGLY
http://video.nationalgeographic.com/video/101-videos/avalanches
http://en.wikipedia.org/wiki/Avalanchehttp://www.ussartf.org/avalanches.htm
http://www.getprepared.gc.ca/cnt/hzd/vlchs-eng.aspx
http://video.nationalgeographic.com/video/101-videos/avalanches
http://en.wikipedia.org/wiki/Avalanchehttp://www.ussartf.org/avalanches.htm
http://www.getprepared.gc.ca/cnt/hzd/vlchs-eng.aspx