The shaking of the earth.
earthquake
A mass of rock and earth moving suddenly and quickly down a steep slope.
landslide
A big wave caused by an earthquake under the sea.
Tsunami
The same as a landslide but in snow.
avalanche
Too much rain in an area.
flood
A long period when there is little or no rain.
drought
When lava explodes out of the earth.
volcanic eruption
Strong, rotating wind that destroys everything in its path.
tornado
An outbreak of a contractible disease that spreads through a human population.
epidemic or pandemic
Massive storms that come from oceans.
Typhoon, Cyclone or Hurricane