| A | B |
|---|
| Earthquake | The shaking that results from movement of rock beneath Earth's surface. |
| Stress | A force that acts on rock to change its shape or volume. |
| Shearing | Stress that PUSHES a mass of rock in opposite directions. |
| Tension | Stress that STRETCHES rock so that it becomes thinner in the middle. |
| Compression | Stress that SQUEEZES rock until it folds or breaks. |
| Deformation | A change in the volume or shape of Earth's crust. |
| Normal Fault | Type of fault where the hanging wall slides downwards; caused by tension in the crust. |
| Strike-Slip Fault | Type of fault where rocks on either side move past each other sideways with a little up-or-down motion. |
| Reverse Fault | A type of fault where hanging walls slides upwards. |
| Anticline | An upward fold in rock formed by compression of Earth's crust. |
| Syncline | A downward fold in rock formed by compression in Earth's crust. |
| Plateau | A large area of FLAT land elevated high ABOVE SEA LEVEL. |
| Focus | Point BENEATH Earth's surface where rock breaks under stress and causes an earthquake. |
| Epicenter | Point on Earth's surface directly ABOVE an Earthquake's focus. |
| P Waves | Type of seismic wave that compresses and expands the ground. |
| S Waves | Type of seismic wave that moves the ground up and down or side to side. |
| Surface Waves | Type of seismic wave that forms when P waves and S waves reach Earth's SURFACE. |
| Magnitude | Measurement of an Earthquake's strength based on seismic waves and movement along faults. |
| Seismograph | Device that records ground movements caused by seismic waves as they move through Earth. |
| Aftershock | Earthquake that occurs after a larger earthquake in the same area. |
