Unit 6 Review - Earthquakes

Fill in the blank: The stress force that pushes a mass of rock in two opposite directions is called ________.

The stress force that squeezes rock until it folds or breaks is called ________.

• A) Tension

• B) Compression

• C) Shearing

What is the scientific meaning of 'fold' in the context of Earth's crust?

• To bend without breaking

• To crush

• To stretch

• To compress

Folds in rock shorten and thicken the Earth's crust. Over time, this process can form _______.

A fold in rock that bends upward into an arch is called an _______.

• A) syncline

• B) anticline

• C) plateau

• D) fault-block mountain

What happens to the footwall as a result of movement along the normal faults?

• It rises

• It sinks

• It remains unchanged

Seismic waves travel through Earth carrying energy released by an ______.

• hurricane

• earthquake

• tornado

• volcano

___ waves can vibrate the ground from side to side.

• P

• S

• Surface

The Richter Scale is used to measure the ______ of an earthquake.

According to the table, what was the magnitude of the earthquake in Sumatra in December 2004?

• 7.5

• 8.6

• 9.2

• 6.8