Earthquakes and Volcanoes

Vibrations caused by an earthquake that carry earthquake’s energy away.

• earthquakes
• seismic waves
• stress

A movement of earth’s lithosphere that occurs when the rocks in the lithosphere suddenly shift, releasing energy.

• earthquake
• seismic waves
• stress

A force within Earth that either squeezes rocks together, pulls them apart, or pushes them in different directions.

• earthquake
• seismic waves
• stress

Fault

• A break in a mass of rock where movement happens.
• Many occur along plate boundaries
• Both

Stress from moving tectonic plates produces faults and folds(pliegues) in Earth’s crust. 

• True
• False

žThree ways that stress can affect rocks. •Squeezes rocks together •Pulls them apart •Pushes them in different directions.

• True
• False

Fold

• A bend in layers of rock
• Forms where rocks are squeezed (apretar) but not break.
• Both
• Neither

Rocks tend to fold instead of break under low temperature or pressure.

• True
• False

Which travels fastest, always being the first detected by seismic stations?

• P waves
• S waves

What do S (secondary) waves do during an earthquake?

• Shake the ground
• Cause eruptions
• Open cracks in the earth's surface
• Create loud noises