Earthquake - A sudden movement of the earth's crust caused by the release of stress accumulated along geologic faults or by volcanic activity. Also called seism, temblor.

This category deals with one of the most destructive weather phenomena, floods. Floods can be caused by hurricanes and heavy rains. They can be in rivers, lakes, streams, even that little harmless creek up the road. Sites listed here discuss anything flood related, from specific flood incidents to the phenomenon behind floods, to how to deal with flooding before and after.

News on the most recent disasters effecting our planet. For history of natural and manmade disasters, check out Society: History: By Time Period: Twentieth Century: Disasters.

A volcano is an opening in a planet's surface which allows hot, molten rock, ash and gases to escape from below the surface. Volcanic activity involving the extrusion of rock tends to form mountains over a period of time.