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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 |