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Plate Tectonics 1-6
Vocab review for lessons 1-6 in Exploring Plate Tectonics
| Term | Definition |
|---|---|
| Earthquake | vibrations in the earth caused by the sudden release of energy |
| seismologist | a scientist who studies earthquakes |
| P-wave | a primary earthquake wave that travels through the body of the earth, first wave to reach a seismograph station |
| S-wave | a secondary earthquake wave, second wave to reach a seismograph station |
| surface wave | wave that travels on or near the surface of the earth |
| body wave | an earthquake wave that travels through the body of the earth instead of on the surface |
| seismogram | the record made by a seismograph |
| seismograph | an instrument that detects, records, and measures the vibrations caused by earthquakes |
| aftershock | an earthquake that follows after the main shock of an earthquake |
| epicenter | the point on the surface of the earth that directly above the focus of an earthquake |
| focus | the location where the rupture of an earthquake begins and energy is released |
| plate boundary | a place where pieces of the broken lithosphere meet |
| Plate Tectonics | the theory t hat the lithosphere is broken into segments, or "plates," that float on the asthenosphere |
| magnitutde | a measure of the total amount of energy released at the focus of an earthquake |
| asthenophere | the layer of the mantle that lies directly under the lithosphere and flows like taffy |
| lithosphere | the crust and upper part of the mantle that is broken into segments, or plates |