| A | B |
|---|
| wave | movement that carries energy through matter and space |
| focus | the point below Earth's surface where energy is released in the form of seismic waves. |
| primary wave | seismic wave that moves rock particles back-and-forth in the same direction the wave travels |
| secondary wave | seismic wave that moves tock particles at right angles to the direction of the wave |
| surface wave | seismic wave that moves rock particles up=and-down in a backward rolling motion and sis to side in a swaying motion. |
| epicenter | point on Earth's surfae directly above an earthquake's focus |
| seismograph | instruct used to register earthquake waves |
| seismic wave | wave generated by an earthquake |
