Avalanches are like land slides, but with snow. It is a skiers/snowboarders worst nightmare. They are caused by noise or by a form of ice on the bottom and a new layer of snow on the top. When a skier/snowboarder goes over it and causes an avalanche. Another way is by simply blasting it to cause an avalanche. It helps it by not causing a skier/snowboarder to die in an avalanche.