Earth's Layers and Seismic Waves

Front

What are the three main layers of the Earth?

Back

Crust, Mantle, Core.

Front

What is the outermost layer of the Earth called?

Back

Crust.

Front

What is the layer beneath the Earth's crust?

Back

Mantle.

Front

What is the core of the Earth primarily made of?

Back

Solid nickel and iron.

Front

What are seismic waves?

Back

Energy radiated in all directions from the focus of an earthquake.

Front

What are P waves?

Back

Primary waves that travel through solids and liquids.

Front

What are S waves?

Back

Secondary waves that only travel through solids.

Front

What is a seismograph?

Back

A recording instrument that measures and records seismic waves.

Front

What is the focus of an earthquake?

Back

The point within the Earth where an earthquake originates.

Front

What is the epicenter of an earthquake?

Back

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