All flames spread quickly through a large area of trees.
forest fire
Snow and ice fall quickly down a mountain.
avalanche
A large quantity of wet earth suddenly falls down the side of a hill.
landslide
When lava explodes out of the earth.
volcanic eruption
A big wave caused by an earthquake under the sea.
tsunami
It can make buildings fall down and set off landslides.
earthquake
A lot of rain covering the earth.
flood
When there is a snow storm for a long time.
blizzard
A violently rotating column of air.
Tornado
An extremely violent wind or storm.
hurricane
A long period without rain.
drought