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Chapter 4 Science
Earthquake
| Question | Answer |
|---|---|
| force | push or pull exerted on an object |
| mass | measure of the amount of matter an object contains and its resistance to movement |
| volume | amount of space that matter occupies |
| tension | stress force that pulls on the crust and thins rock in the middle |
| compression | stress force that squeezes rock until it folds or breaks |
| shearing | cause rock to break and slip apart or to change its shape |
| normal fault | fault cuts through rock at an angle so one block of rock sits over the fault and the other lies under the block |
| reverse fault | fault in which blocks move in reverse direction |
| strike-slip fault | fault in which the rocks on either side of the fault slip past each other sideways |
| plateau | large area of flat land elevated high about sea level |
| earthquake | shaking and trembling that results from movement of rock beneath Earth's surface |
| focus | area beneath Earth's surface where rock that was under stress begins to break or move |
| epicenter | point on the surface directly about the focus |
| P waves | seismic waves that compress and expand the ground like an accordion |
| S waves | sesmic waves that can vibrate from side to side |
| surface waves | move more slowly that P and S waves but produce severe ground movements |
| seismograph | instrument that records and measures an earthquake's seismic waves |
| seismogram | pattern of lines that is a record of an earthquake's seismic waves |
| magnitude | single number that geologists assign to an earthquake based on the earthquake's size |
Created by:
dselling
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