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Inside the Earth #3
| Term | Definition |
|---|---|
| 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
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