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thumb|upright=1.25|A powder snow avalanche in the Himalayas near [[Mount Everest]] An avalanche is a rapid flow of snow down a slope, such as a hill or mountain. 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. Primarily composed of flowing snow and air, large avalanches have the capability to capture and move ice, rocks, and trees.

AI overview

An avalanche is a rapid flow of snow down a slope such as a hill or mountain, which can be triggered by natural factors like heavy precipitation or snowpack weakening, or by external causes like humans, animals, and earthquakes. Large avalanches matter because they can capture and move not just snow and air, but also ice, rocks, and trees, making them potentially destructive events.

AI-generated from the Wikipedia summary — may contain errors.