Indiana Science Grade 8

Chapter 13: Earthquakes

Earthquakes

1.
Earthquakes occur when rocks __________.
A)compress
B)stretch
C)break
D)bend
2.
Reverse faults occur as a result of __________ forces.
A)shear
B)normal
C)compression
D)tension
3.
Which layer of Earth is plasticlike?
A)outer core
B)inner core
C)upper mantle
D)crust
4.
The __________ of an earthquake is located on Earth's surface directly above the earthquake's origin.
A)focus
B)seismic point
C)epicenter
D)seismogram
5.
A(n) __________ is caused by underwater earthquakes.
A)epicenter
B)tsunami
C)Moho
D)seismogram
6.
A person who studies earthquakes is called a(n) __________.
A)meteorologist
B)cartographer
C)astronomer
D)seismologist
7.
In the shadow zone, seismic waves are __________.
A)speeding up
B)not detected
C)slowing down
D)disappearing
8.
__________ faults are formed by forces of tension.
A)Strike-slip
B)Compression
C)Reverse
D)Normal
9.
__________ waves produce the most earthquake destruction.
A)Primary
B)Surface
C)Tsunami
D)Secondary
10.
Mountains are formed on the __________.
A)crust
B)outer core
C)upper mantle
D)inner core
11.
What happens as seismic waves reach the Mohorovicic discontinuity, or Moho?
A)They slow down because they are moving to a denser layer.
B)They speed up because they are moving to a denser layer.
C)They speed up because they are moving to a less dense layer.
D)They slow down because they are moving to a less dense area.
12.
Earthquakes are more likely to occur in __________.
A)northern Africa
B)every location equally
C)western South America
D)northern Russia
13.
Rocks can break when the __________ is exceeded.
A)elastic limit
B)elastic deformation
C)plate boundary
D)fault line
14.
Rocks sliding past each other are a display of __________ forces.
A)shear
B)compression
C)tension
D)normal
15.
Which wave type can pass through the solid inner core?
A)primary
B)surface
C)seismic
D)secondary
16.
Which of the following statements about earthquake magnitude or strength is true?
A)Earthquakes measured at high magnitudes occur more frequently than those at low magnitudes.
B)Earthquake magnitude or strength is measured by the Mercalli scale.
C)For each 1.0 increase in magnitude, the amount of energy released increases by more than 30 times.
D)The amount of energy released by an earthquake increases at the same rate as the rate of magnitude (1.0 to 1.0).
17.
One rock surface hanging over an adjacent rock surface might indicate that __________ fault action has occurred.
A)compression
B)strike-slip
C)normal
D)reverse
18.
Forces of __________ result in rocks being stretched apart.
A)compression
B)normal
C)shear
D)tension
19.
The San Andreas Fault is the largest fault of this kind in California.
A)strike-slip
B)normal
C)compression
D)reverse
20.
The Mercalli Intensity Scale measures an earthquake's __________.
A)strength
B)level of destruction
C)duration
D)magnitude
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