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| the undulating border at the core mantle boundary, may be partially liquid. |
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| a circulation patten in which low-density material rises and high-density material sinks. |
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| the balance or equilibrium of adjacent blocks of brittle lithoshere "floating" on the asthenosphere. |
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| vertical movement to reach equilibrium. |
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| rise in crustal lithosphere after the removal of heavy material (ICE) |
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| tool used to study the crust and mantle by measuring gravitational attraction. |
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Definition
| A gravity reading higher than the normal regional gravity. |
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Definition
| A reading lower than the regional gravity. |
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| A region of magnetic force that surrounds the earth. |
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Definition
| The central point of magnetic fields |
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| A change in polarity of the magnetic field. |
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| A point below which a material becomes magnetized. |
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Definition
| The study of ancient magnetic fields. |
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Definition
| An instrument used to measure the strength of Earth's magnetic field. |
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Definition
| The temperature increase with the depth into Earth. |
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| The gradual loss of heat through the surface. |
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| The application of physical laws and principles to a study of the Earth. |
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| The return of some of the energy of seismic waves to Earth's surface after the waves bounce off a rock boundary. |
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Definition
| The bending of seismic waves as they pass from one material to another. |
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