Big earthquakes can be found where plates meet.

The Ring of Fire is around the Atlantic Ocean. Most of the world's biggest quakes occur here.

In 1906 many houses in San Francisco burned down because they were made of wood.

Earthquakes that happen on the ocean floor are called tsunamis.

The Earth’s crust is thinnest under the continents.

Faults are places where two plates meet. They can be hundreds of km long.

Earthquakes can also be caused by underground explosions.

Most earthquakes occur after big volcanoes erupt.

When there is a sudden movement in the earth's crust, energy is set free and moves in the form of waves.

An instrument made to find out how strong earthquakes are is called a hypocentre.

The Richter scale tells you how many people died in an earthquake.

The place above the Earth where the most damage is done is called the epicentre.

Today, it is important to use wood when you construct houses or buildings in earthquake zones.