Chapter11 Question Preview (ID: 46046)
11.
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____________ are seismic waves that compress and expand the ground like an accordion. They are the first waves to arrive to the seismograph.
a) P waves
b) surface waves
c) S waves
d) W waves
______________ are siesmic waves that can vibrate from side to side or up and down. They are secondary waves during an earthquake.
a) P waves
b) surface waves
c) S waves
d) W waves
A ____________________ is an instrument that records and measures an earthquake's seismic waves.
a) triple beam balance
b) seismograph
c) seismogram
d) spring scale
Where are the areas that are at greatest risk from earthquakes?
a) in the center of plates
b) where plates meet
c) in the middle of the ocean
d) where land meets water
When an earthquake occurs, seismic waves travel _________________________.
a) only through the hanging wall
b) only through the footwall
c) outward from the focus
d) inward to the epicenter
Which scale would a geologist use to estimate the total energy released by an earthquake?
a) Modified Mercalli Scale
b) Richter scale
c) epicenter scale
d) moment magnitude scale
Compression causes the formation of
a) only anticlines
b) only synclines
c) both anticlines and synclines
d) neither anticlines nor synclines
An earthquake occurs along a fault when
a) energy in the rock along the fault does not change for a long period of time.
b) stress in the rock along the fault causes the rock to melt.
c) enough energy builds up in the rock along the fault to cause the rock to break or slip.
d) energy in the rock along the fault is changed to heat.
A fault in which the rocks on either side of the fault move sideways past each other is a
a) slip-stike fault
b) normal fault
c) hanging fault
d) reverse fault
The stress force that squeezes rock until it folds or breaks is
a) shearing
b) comression
c) tension
d) uplifting
The stress force that pulls on the crust and thins rock in the middle is
a) shearing
b) compression
c) tension
d) uplifting
_____________ can make the ground roll like ocean waves.
a) P waves
b) Surface waves
c) S waves
d) W waves
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