Front

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

Back

Crust

Front

What is used to determine earthquake risk?

Back

Strain in rocks near faults

Front

What is the Earth's core primarily made of?

Back

Iron and nickel

Front

What happens during liquefaction?

Back

Loose, saturated soil turns into liquid that can’t support buildings.

Front

What is a fault?

Back

A fracture in Earth where movement has occurred.

Front

What is the process of seismic waves traveling through the Earth called?

Back

Seismic propagation.

Front

What are the two main types of seismic waves?

Back

P-waves (primary waves) and S-waves (secondary waves).

Front

What is the point on the Earth's surface directly above the earthquake's focus called?

Back

Epicenter.

Front

What instrument is used to measure seismic waves?

Back

Seismometer.

Front

What is the scale used to measure the magnitude of an earthquake?

Back

Richter scale.