British woman found dead under a heap of snow in Mont Blanc avalanche | UK | News

An avalanche usually happens when a layer of snow collapses, and begins to slide downhill. They can be caused by any one of four factors.

This is; a steep slope, snow cover, a weak layer in the snow or a separate trigger.

A trigger could be caused by fresh snowfall adding a new layer to an already existing snowpack. If it becomes overloaded, a slide may start.

Earthquakes can also set off avalanches, along with much smaller vibrations.

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