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Vocabulary words for science quiz chapter 2

stress the force that acts on rocks to change the rock's shape or volume
deformation the change in the shape or volume of the crust
shearing type of stress which pushes a mass of rock in two opposite directions
tension type of stress which stretches rock
compression type of stress that squeezes rock until it folds or breaks
focus the point where an earthquake originates - underground
epicenter the point on the surface directly above the focus
surface waves the slowest of the seismic waves; the most destructive and cause severe damage
primary waves (P waves) the fastest and can travel through anything
secondary waves (S waves) not able to travel through water and are second fast
seismograph device used to record ground movements caused by seismic waves
aftershock an earthquake that occurs after a larger earthquake in the same area
creep meter stretching wire raises a weighted pointer to show change and a strike-slip fault
laser-ranging device measures the amount of time it takes for a laser to reach a target on one side of the fault and bounce back and is great for seeing change along a divergent boundary where there is tension
tilt meter like a carpenter's level, great for showing a rise or fall in the ground
Created by: ilievam969