| A | B |
|---|
| Earthquake | A shaking of the ground caused by the sudden movement of large blocks of rocks along a fault. |
| Fault | A fracture in Earth’s lithosphere along which blocks of rock move past each other. |
| Stress | The force applied by an object pressing on, pulling on, or pushing against another object. |
| Seismic Wave | The vibrations caused by an earthquake. |
| Focus | In an earthquake, the point underground where the rocks first begin to move. |
| Epicenter | The point on Earth’s surface directly above the focus of an earthquake. |
| Seismograph | An instrument that constantly records ground movements. |
| Aftershock | A smaller earthquake that follows a more powerful earthquake in the same area. |
| Liquefaction | A process in which the shaking of ground causes loose, wet soil to act like a liquid. |
| Tsunami | A water wave caused by an earthquake, volcanic eruption, or landslide. |
