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Geology Vocab Set 2
Question | Answer |
---|---|
Lithosphere | A rigid layer made up of the uppermost part of the mantle and the crust. |
lithospheric plates | large pieces of Earth's lithosphere that move over the asthenosphere |
plate boundaries | the edges of tectonic plates. |
Asthenosphere | The soft layer of the mantle on which the lithosphere floats. |
magnitude | Measure of the energy released during an earthquake |
divergent boundary | A plate boundary where two plates move away from each other. |
mid-ocean ridge | An underwater mountain chain where new ocean floor is formed |
convergent boundary | A plate boundary where two plates move toward each other. |
subduction zone | The region where oceanic plates sink down into the asthenosphere. |
trench | A deep, steep-sided canyon in the ocean floor. |
transform boundary | A plate boundary where two plates move past each other in opposite directions |
Crust | the outermost layer of the Earth |
seismometers | measure the seismic waves transmitted from earthquakes |
seismic waves | The waves that transmit energy as a result of an earthquake |
mantle | almost 3,000 km thick, the uppermost part is relatively cold compared with what is below it. Thus, it remains in a hard, solid state |