An AVALANCHE is a sudden, overwhelming quantity of snow, ice, and rocks that rapidly moves down a mountainside. It is caused by the force of gravity and can be triggered by a variety of factors such as rapid snow accumulation, earthquakes, or even loud noises. Avalanches can cause significant destruction to buildings, roads, and other structures in their path. They can also be deadly, making it important for people to be aware of the risks associated with them.