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Geology 115
Chapter 2
19
Geology
Undergraduate 1
10/08/2007

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Term
Ultra Low Velocity Zone
Definition
the undulating border at the core mantle boundary, may be partially liquid.
Term

Convection

Definition
a circulation patten in which low-density material rises and high-density material sinks.
Term
Isostasy
Definition
the balance or equilibrium of adjacent blocks of brittle lithoshere "floating" on the asthenosphere.
Term
Isostatic Adjustment
Definition
vertical movement to reach equilibrium.
Term
Crustal Rebound
Definition
rise in crustal lithosphere after the removal of heavy material (ICE)
Term
Gravity Meter
Definition
tool used to study the crust and mantle by measuring gravitational attraction.
Term
Positive Gravity Anomaly
Definition
A gravity reading higher than the normal regional gravity.
Term
Negative Gravity Anomaly
Definition
A reading lower than the regional gravity.
Term
Magnetic Field
Definition
A region of magnetic force that surrounds the earth.
Term
Magnetic Poles
Definition
The central point of magnetic fields
Term
Magnetic Reversal
Definition
A change in polarity of the magnetic field.
Term
Curie Point
Definition
A point below which a material becomes magnetized.
Term
Paleomagnetism
Definition
The study of ancient magnetic fields.
Term
Magnetometer
Definition
An instrument used to measure the strength of Earth's magnetic field.
Term
Geothermal Gradient
Definition
The temperature increase with the depth into Earth.
Term
Heat Flow
Definition
The gradual loss of heat through the surface.
Term
Geophysics
Definition
The application of physical laws and principles to a study of the Earth.
Term
Seismic Reflection
Definition
The return of some of the energy of seismic waves to Earth's surface after the waves bounce off a rock boundary.
Term
Seismic Refraction
Definition
The bending of seismic waves as they pass from one material to another.
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