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15
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What does a one point increase in moment magnitude mean?
The energy is about 32 times more
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15
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What is the focus of an earthquake?
The area beneath Earth's surface where rock that was under stress begins to break or move
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lifesaver
Give 10 points!
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gift
Win 20 points!
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rocket
Go to first place!
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baam
Lose 5 points!
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What is a seismograph?
An instrument that records and measures an earthquake's seismic waves
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baam
Lose 25 points!
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shark
Other team loses 25 points!
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rocket
Go to first place!
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lifesaver
Give 15 points!
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boom
Lose 50 points!
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star
Double points!
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rocket
Go to first place!
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thief
Give points!
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15
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What are the first waves to arrive from an earthquake?
P waves
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What do P waves do to the ground?
Compress and expand it like an accordion
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Which type of seismic wave is not sent out from the earthquake's focus?
Surface waves
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What scale do geologists use to rate the total energy an earthquake releases?
Moment magnitude scale
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What layer of the Earth do most earthquakes begin in?
The lithosphere
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What are seismic waves?
They are similar to sound waves, and they travel through Earth carrying energy released by an earthquake.
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What are three types of seismic waves?
P waves, S waves, and surface waves
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trap
No points!
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star
Double points!
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fairy
Take points!
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25
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lifesaver
Give 20 points!
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15
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How do surface waves move?
Like ocean waves in an almost circular pattern
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How do geologists monitor earthquakes?
They measure the seismic waves produced
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