Tornado
Desertification
An iceberg
Flood
Forest fire
Drought
Earthquake
An epidemic
Famine
A very large piece of ice in the sea.
A serious shortage of food in a country whihc may cause many deaths.
A violent storm accompanied by very strong circular winds.
A long period when there's little or no rain.
A shaking of the ground caused by movement of the earth's crust.
A rapid development and spread of a disease in an area.
When a large amount of water covers an area that's usually dry.
An uncontrolled fire in the wooded areas.
The process of fertile land becoming desert.