Put the elements into the gaps

• snowslide
• spontaneously
• disaster
• earthquakes
• mass
• range
• wipe out

An Avalanche

An avalanche or a [ ] is a quick flow of snow down a hill or a mountain.

Avalanches can be very dangerous because they can appear [ ] and capture and move ice, rocks, and trees destroying everything on their way.

This natural [ ] can be caused by many factors, the most widespread are human or animal activity and [ ]. Avalanches can occur mostly by a collapse of an underlying weak snow layer. Gradually they grow in [ ] and volume as they get more snow.

Avalanches can happen in any mountain [ ] and are most frequent in winter or spring. They can easily [ ] buildings and other forms of people's property.