What are the cause of avalanche?

Answer:
all it is, is a section of loose snow so when it is disturbed for example by a skiier or snowboarder rides over it moves rapidly down the mountin and wipes out any thing in it way hope tht helps :)
First answer by Megz2. Last edit by Megz2. Contributor trust: 0 [recommend contributor recommended]. Question popularity: 1 [recommend question].