Earthquakes
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| plate | a large section of earths crust and rigid upper mantle that moves around on the asthenosphere
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| fault | surface along which rocks move when they pass there elastic limit and break
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| earthquake | the vibration produced by the breaking of rock
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| normal fault | rock above the fault surface moves downward in relation to rock below the fault surface
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| reverse fault | rock above the surface is forced up and over the rock below the fault surface
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| strike-slip fault | rocks on either side of the fault move past eachother without much upward or downward movement
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| wave | rhythmic movement that carries energy through matter and space
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| seismic wave | waves generated by earthquakes that travel through earth
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| focus | the point where the seismic waves energy is released
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| primary wave | cause particles in rocks to move back and forth in the same direction that the wave is traveling
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| secondary wave | move through earth by causing particles in rocks to move at right angles to the direction of wave travel
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| surface waves | move rock particles in a backward rolling motion and a side to side swaying motion
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| seismograph | instrument used to register earthquake waves and record the time that each arrived
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| epicenter | the point on earths surface directly above an earthquakes focus
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| crest | the highest point of a wave
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| magnitude | the measurement of energy released by a earthquake
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| liquefacation | when earthquakes cause soil to act more like a liquid
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| tsunamis | ocean waves caused by earthquakes
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