is a large mass of snow and ice at an high altitude that slides down mountain slopes ........

General Studies (CHSL) Geography

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_________ is a large mass of snow and ice at an high altitude that slides down mountain slopes.

Volcano

Cyclone

Avalanche

Hurricane

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Explanation:

An avalanche is an event that occurs when a cohesive slab of snow lying upon a weaker layer of snow fractures and slides down a steep slope.Avalanches are typically triggered in a starting zone from a mechanical failure in the snowpack when the forces of the snow exceed its strength but sometimes only with gradual widening.