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NATURAL DISASTERS: Avalanches

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National Geographic Avalanches 101

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Speed of snow sliding down a slope reaches around 90 Km/hr during a rapid Avalanche.

Avalanches

An avalanche happens when a layer of snow becomes loose and slides downhill. Thousands of avalanches occur every winter in the mountains and are usually triggered by people. Avalanches are caused by these four factors: a steep slope, a snow cover, a weak layer in the snow cover and a trigger such as a snowboarders or skiers.

 

Unleash an Avalanche Interactive

National Geographic Encyclopedia

Avalanches

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