Geophysics is the study of the forces that shape the Earth from a global perspective. Learn about gravity, plate tectonics and other topics.

A seismograph can accurately measure the movement of the Earth during a quake. How does a seismograph work, though, and what is the Richter scale that is associated with earthquakes? Learn the answers to these questions in this article.

Water is one of the most abundant substances on the planet. About 70 percent of our planet is covered by ocean. Just how much water is there on Earth? Find out the answer to this question in this article.

Gravity is a force that we experience every minute of our lives, but hardly notice or give a passing thought to in our daily routines. Have you ever wondered what gravity is and how it works? Learn about the force of gravity in this article.

Do you ever play that game in which you select the items you'd bring if you got stuck on a desert island? Along with that treasured bootleg recording of your favorite band, we think that an endless supply of water should be at the top of your list. Here's why.