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Inside the Earth #3

TermDefinition
tension stress that stretches rock so that it becomes thinner in the middle
compression stress that squeezes rock until it folds or breaks
shearing stress that pushes masses of rock in opposite directions in a sideways movement
normal fault one where the hanging wall slides downward; caused by tension in the crust
reverse fault one where the hanging wall slides upward; caused by compression in the crust
strike-slip fault one where rocks on either side move past each other sideways with little up or down motion
focus the point beneath Earth's surface where rock breaks under stress and causes an earthquake
epicenter the point on Earth's surface directly above an earthquake's focus
magnitude the measure of an earthquake's strength based on seismic waves and movement along the fault
Richter scale a scale that rates an earthquake's magnitude based on the size of its seismic waves
liquefaction the process by which an earthquake's motion suddenly turns loose soil into liquid mud
aftershock an earthquake that occurs after a large earthquake in the same area
tsunami a giant wave usually caused by an earthquake beneath the ocean floor
Created by: Rita.Rogers