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*Earthquakes (Ch 4)

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