Earthquakes Earth's Mightiest Moments

Each year there are millions of earthquakes. . Most are mild tremors that cause no damage. They usually go unnoticed. What causes Earth to quiver and shake? This basic introduction explains why Earth's surface sometimes moves. It shows young readers how scientists believe the earth is made, from its hot iron core to the enormous floating plates that form the cool outer crust where we live.Harrison, David L. is the author of 'Earthquakes Earth's Mightiest Moments', published 2004 under ISBN 9781590782439 and ISBN 1590782437.