Term
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Definition
| the application of physical laws and principles to a study of Earth |
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Definition
| 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
| thick shell of rock that separates the crust above from the core below |
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Definition
the central zone of Earth.
probably metallic and the source of Earth's magnetic field |
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Term
Mohorovicic disconinuity
(Moho) |
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Definition
| the foundary that separates the crust from the mantle beneath |
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Term
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Definition
crust and uppermost mantle together
outer shell of Earth that is relatively strong and brittle |
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Definition
low velocity zone
seismic waves travel more slowly than they do in shallower layers |
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Term
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Definition
region between 103 degress and 142 degrees which lacks P waves.
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Definition
| a balance of adjacent blocks of brittle lithosphere floating on the asthenosphere |
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Definition
| concept of vertical movement to reach equilibrium |
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Definition
| rise of the crustal lithosphere after the removal of the ice |
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Definition
| measures the gravitational attraction between Earth and a mass within the instrument |
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Definition
| a gravity reading higher than the normal regional gravity |
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Definition
| a gravity reading lower than the normal regional gravity |
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Definition
a region of magnetic force
surrounds earth
deflect magnetized objects, such as compass needles |
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Term
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Definition
north and south
strength of the magnetic field is at its greatest at the magnetic poles, where magnetic lines of force appear to leave and enter Earth vertically |
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Term
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Definition
change in the polarity of the magnetic field.
magnetic lines of force run the other way, leavin earth near the north pole and entering near the south pole. |
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Term
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Definition
580 degrees for magnetite
as lava cools slowly below the curie point, magnetic record is permanently traped in the rock |
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Term
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Definition
| 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
| temperature increase with depth into Earth |
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Term
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Definition
| gradual loss of heat through Earth's surface |
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