What causes avalanches?
it is caused when rapid temperature changes occur, a heavy snow
fall, or strong winds. Skiers or snowboarders also set off
avalanches because they will ski on the fresh loose snow and if the
conditions are right the snow will crack beneath them. Loud noises
do not set off avalanches. If you don't believe me look up
"Avalanches 101" on youtube.com or nationalgeographic.com