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Nils
| Question | Answer |
|---|---|
| plate | rigid upper mantle that moves around on the asthenosphere |
| fault | surface along which rocks move when they pass their elastic limit |
| earthquake | vibrations produced when rocks break along a fault |
| normal fault | break in rock caused by tension forces where rock moves down |
| reverse fault | break in rock caused by compresion forces and it moves upward |
| strike-slip fault | break in rock caused by shear forces and they move past each other |
| wave | rythmic movement of energy |
| seismic wave | wave generated by an earthquake |
| focus | the point below earths surface where energy is released |
| primary wave | seismic waves that moves rock particles back and forth |
| secondary wave | seismic waves that moves rock particles at a right angle |
| surface wave | seismic waves that move up and down and side to side` |
| epicenter | point directly above focus |
| seismograph | instrument used to register earthquake waves |
| crest | highest point of a wave |