Earthquakes

What is the correct order in which seismic waves arrive at a seismograph?

• surface, S, P
• P, S, surface
• P, surface, S

The slowest type of seismic wave is...

• P waves
• Surface waves
• S waves

When the ground shakes because rock has moved inside Earth, it is called a(n)...

• earthquake
• epicenter
• focus

The point on the surface above the focus is called a(n)

• epic
• focus
• epicenter

The exact location where rock breaks and causes an earthquake

• epicenter
• focus
• imbalance

An instrument that measures seismic waves

• seismograph
• seismic machine
• magnitude scale

The fastest seismic wave

• P wave
• S wave
• Surface wave

Scale that is based on the size of seismic waves

• Moment magnitude scale
• Mercalli scale
• Richter scale

Which state has the most seismic activity?

• Alaska
• California
• North Dakota

True or False
Powerful earthquakes can be felt thousands of miles away from an epicenter

• True
• False