Avalanche, a mass of material moving rapidly down a slope. An avalanche is typically triggered when material on a slope breaks loose from its surroundings; this material then quickly collects and carries additional material down the slope.
An avalanche is a rapid flow of snow down a slope, such as a hill or mountain. [1] . Avalanches can be triggered spontaneously, by factors such as increased precipitation or snowpack weakening, or by external means such as humans, other animals, and earthquakes.
Avalanches are masses of snow, ice, and rocks that fall rapidly down a mountainside. They can be deadly.