Front

What is the Earth's thin, rocky outer layer called?

Back

Crust

Front

Where do earthquakes most often occur?

Back

Near plate boundaries

Front

What natural disaster might occur shortly after a major earthquake in a coastal city?

Back

A tsunami

Front

What can a travel-time graph be used to find in relation to earthquakes?

Back

The epicenter of an earthquake.

Front

What are the three main layers of the Earth?

Back

Crust, mantle, core

Front

What is the focus of an earthquake?

Back

The point within the Earth where an earthquake originates.

Front

What is the difference between the epicenter and the focus of an earthquake?

Back

The epicenter is the point on the Earth's surface directly above the focus.

Front

What is a seismic wave?

Back

A wave of energy that travels through the Earth, often as a result of an earthquake.

Front

What is the Richter scale used for?

Back

To measure the magnitude of an earthquake.

Front

What is a tectonic plate?

Back

A massive, irregularly shaped slab of solid rock that makes up the Earth's lithosphere.