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Earthquakes (Ch 4)

Name:________________________
Class: ___________ Date: ________
Across
The ______ is the area beneath Earth's surface where rock that was under stress begins to break or move.
The first seismic waves to arrive are _______ waves.
______ faults form where rock is pulled apart by tension.
After P waves come _______ waves.
Stress that occurs where two plates pull apart is called ______.
An _____ is a smaller earthquake that occurs after a larger earthquake.
Earthquake risk largely depends on how _____ a given location is to a plate boundary.
_______ is the stress force that squeezes rock until it folds or breaks.
Earthquakes often occur along _____ boundaries.
A fold in rock that bends upward into an arch is an _______.
An earthquake's magnitude is rated on the _____ Scale.
An ______ is the shaking and trembling that results from movement of rock beneath Earth's surface.
In the United States, two plates meet along the _____ coast.
______ is the force that acts on rock to change it's shape or volume.
______ waves are vibrations similar to sound waves that carry energy released by an earthquake.
____ is the stress force that pushes rock in two opposite directions. It happens where two plates slip past each other.
Down
Seismic waves cause the seismograph's ______ to vibrate.
The _____ magnitude scale rates the total energy an earthquake releases.
A fold that bends downward in a V shape is a _______.
A ______ is a large area of flat land that was lifted high above sea level.
_____ faults form where compression pushes the rock of the crust together.
A fault-________ mountain forms when the hanging walls of two normal faults drop down on either side of the footwall.
The point on Earth's surface directly above the focus is called the ______.
Frequent earthquakes occur in _____ where the Pacific plate and the North American plate meet along the San Andreas fault.
Surface waves move more ______ than P and S waves, but can produce severe ground movements.
Seismic waves are recorded by an instrument called a ______.
A _____ is the record of an earthquake's seismic waves produced by a seismograph.
Compression happens where two plates come _______ and push against each other.
Many of the world's earthquakes occur in a vast area of geological activity called the ______ of Fire.
The Modified _____ Scale rates the amount of shaking from an earthquake.
Shearing produces ______-slip faults.
Both P and S waves can become ______ waves.
Geologists map the distance of the earthquake from at least _____ seismograph stations to locate the epicenter.