When snow rapidly flows down a mountain or hill
Avalanche
A long period of dry conditions, caused by a lack of rain
Drought
When the ground shakes because of activity below the earth's surface
Earthquake
When a disease spreads quickly and infects many people
Epidemic
When a large amount of water covers an area
A fire that burns a forest or wooded area
Forest fire
A powerful, windy storm that forms over water
Hurricane
One or more powerful waves formed by underwater earthquakes
Tsunami
When gas and lava are released from a volcano
Eruption
