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| branch of geology that applies physical laws and principles to the study of the Earth |
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| return of some energy of seismic waves to Earth's surface after the waves bounce off a rock boundary |
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Definition
| bending of seismic waves as they pass from one material to another |
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| outer layer of rock which forms a thin skin on Earth's surface |
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| central zone of the Earth, probably metallic and the source of Earth's magnetic field |
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| continental crust, rocks high in feldspar and silicon |
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| rocks in the oceanic crust high in magnesium and iron |
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| Mohorovicic discontinuity |
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Definition
| the boundary that separates the crust from the mantle |
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| outer shell of Earth that is relatively strong and brittle that makes up the plates of plate-tectonic theory |
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| zone that extends about 200 kilometers, where the rocks may be closer to their melting point and where seismic waves slow down (low-velocity zone) |
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| region between 103 and 142 degrees where one type of seismic wave is lacking because of refraction |
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Term
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Definition
| region greater than 103 degrees where one type of seismic wave is lacking because it cannot travel through liquid |
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