Earthquakes

The huge pieces of the earth's crust are called ____________________________. 

• crust
• plates
• directions
• seismos

The epicenter of an earthquake is

• The point below the surface where rock begins to break and the first motion occurs
• The seismic station closest to the earthquake
• The place where the greatest damage occurs
• The point on the surface directly above the focus

The Richter scale measures:

• the amount of radon gas released
• the movement of plates
• the strength of an earthquake
• the weight of tectonic plates

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

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

An instrument that detects and measures earthquakes is a 

• seismogram
• focus seismic map
• focus
• seismograph 

Earthquakes under the water can cause _________________________________.

• tornadoes
• tsunamis
• lightening
• hailstorms

A tracing of earthquake motion that is created by a seismograph. This can be on a huge sheet of paper, shows P-waves 

• Seimogram 
• Seismic wave
• Carrollton 
• Deformed 

Seismology

• Branch of science that studies earthquakes 
• Earthquakes 
• The sudden return to elastically deformed rock to its original shape. 
• Focus 

Smaller earthquakes that occur in the same area after a larger earthquake has occurred.

• aftershock
• liquefaction
• tsunami

What causes the buildup of energy that is released at a later time when an earthquake occurs?

• Heat from earth's core slowly melts the rocks found in the Earth's crust
• Nuclear reactions in Earth's lower crust release electromagnetic waves
• Jagged edges along a fault generate friction (heat) between two moving plates
• According to the elastic rebound theory, rocks bend until their strength is exceeded.