Thousands of earthquakes occur on our planet each year. The largest cause deadly damage. They crumple buildings and bridges. They set off massive landslides. Some also spark devastating waves called tsunamis.
Thousands of earthquakes occur on our planet each year. The largest cause deadly damage. They crumple buildings and bridges. They set off massive landslides. Some also spark devastating waves called tsunamis.
There, heated rocky material is flexible. It moves slowly and steadily. Near Earth's surface the rocky material cools. The crust of Earth is formed of plates made of this material.