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Chapter 4 Science

Earthquake

QuestionAnswer
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