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.
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.
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.
Avalanches occur in two general forms, or combinations thereof: slab avalanches made of tightly packed snow, triggered by a collapse of an underlying weak snow layer, and loose snow avalanches made of looser snow. After being set off, avalanches usually accelerate rapidly and grow in mass and volume as they capture more snow. If an avalanche moves fast enough, some of the snow may mix with the air, forming a powder snow avalanche.
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