Defines a landslide, avalanche, and a rockslide and provides examples. Describes the causes and effects of these events.

This BBC article reports on the natural disaster that occurred in Peru in 1962 when a massive avalanche destroyed towns and villages with tons of snow, rocks, and mud.

This fantastic multimedia site contains information about the causes of extreme and dangerous weather. The site explains how the earth's surface affects the weather and supplies incredible video clips to illustrate the concepts...

Explains what a natural disaster is and provides a list of every type along with a short description of each.

Explains what a diode is and what its purpose is, and describes eight different kinds of diodes.