Volcanoes and Earthquakes

P waves..

• cause the most damage
• are the slower waves
• are the faster waves
• vibrate at right angles

What is the Richter scale?

• indicates the amount of damage done by an earthquake
• measures the amount of energy released in an earthquake
• predicts when earthquakes will occur

What is a shield volcano?

• starts with thick magma
• throws rocks and cinders into the air
• erupts with thin lava that spreads over great distances

Click the choice that best completes the sentence. "Along a transform fault boundary...."

• plates slide past each other
• sea-floor spreading takes place
• one plate slides under another plate

What happens along a transform fault boundary?

• crust is produced
• Two of Earth's plates grind past each other. Earthquakes may occur often.
• Two of Earth's plates collide

True of false: composite volcanoes are a combination of cinder cone and shield volcano.

• true
• false

What can be true for both a shield volcano and a composite volcano?

• they both erupt voilently
• they both erupt gently
• they erupt in a short amount of time

What is true for only a composite volcano?

• it switches between quiet and violent
• it is the largest volcano
• it is no taller than 300 m

After an earthquake, the first wave to reach a recording station is a _____, followed by an _____.

• S wave, P wave
• P wave, S wave

In an earthquake, the ____ is the point in Earth's crust where rocks first break and move.

• epicenter
• focus