The Earth has experienced many episodes of dramatic climate change over the...More

Coastlines offer some of the best scenery and recreation areas, yet they al...More

There are many different types of floods, ranging from slowly rising region...More

Asteroids and comets are space objects that orbit the Sun. When they enter ...More

The Hazardous Earth is intended to provide middle and high school students ...More

A tsunami is a seismic sea wave generated by a sudden displacement of the s...More

The outermost layer of the Earth consists of different materials, comprisin...More