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7th Grade Science Earthquakes
Terms in this set (32)
Stress that pushes a mass of rock in two opposite directions is called
Because stress is a force, it
Adds energy to rock
In a normal fault, the part of the fault that lies below the other part is called the
Which type of stress force produces reverse faults?
The land between two normal faults moves upward to form a
A fold in rock that bends upward into an arch is called an
The point beneath Earth's surface where rock breaks under stress and triggers an earthquake is called the
The type of seismic waves that arrive at the surface first and move by compressing and expanding the ground like an accordion are called
S waves are also known as
Compared to P waves and S waves, surface waves move
Which scale would most likely be used to tell how much earthquake damage was done to homes and other buildings?
The Mercalli Scale
What does a seismograph record?
The ground movements caused by seismic waves
Which of the following can cause damage days or months after a large earthquake?
If the Coast Guard warns of a giant wave of water approaching the shore as a result of a major earthquake, they are warning of
A building designed to reduce the amount of energy that reaches the building during an earthquake is called a
The best way to protect yourself in an earthquake is to
Drop, cover, and hold
A device that uses wire stretched across a fault to measure horizontal movement of the ground is called a
Which of the following monitors both vertical and horizontal movements along a fault?
GPS satellite system
Geologists know that wherever plate movement stores energy in the rock along faults,
Earthquakes are likely
The risk of earthquakes is high along the Pacific coast of the United States because
That is where the Pacific and North Atlantic plates meet
A force that acts on rock to change its shape or volume is called
Most earthquake-related deaths and injuries result from
Damage to buildings or other structures
In a strike-slip fault, the rocks on either side of the fault slip past each other sideways with little
A large area of flat land elevated high above sea level is called a
What happens when friction between the opposite sides of a fault is high?
The fault locks, and stress builds up until an earthquake occurs.
In what direction do seismic waves carry the energy of an earthquake?
Away from the focus
Which type of fault-monitoring device is most like a carpenter's level?
What type of earthquake wave can travel through both liquids and solids?
The rating system that estimates the total energy released by an earthquake is called the
Geologists cannot yet predict earthquakes because
they can't be sure when and where stress will be released along a fault.
A type of seismic wave that moves the ground up and down or side to side
The block of rock that forms the upper half of a fault.
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