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Ch.17 (Exam 3)

Earths Interior

High _____ is usually an indication of a magma body or still-cooling pluton near the surface. heat flow
Heat flow ______ the crest of the mid-oceanic ridges. decreases away from
Detailed images provided by _____ suggest that the mantle is heterogeneous, probably due to variations in temperature, composition, and density. seismic reflection
What is the asthenosphere? It is the zone of weakness in the mantle on which the lithosphere moves.
___ indicates that the core of the Earth is a liquid The S-wave shadow zone
_______ is a balance or equilibrium of adjacent blocks of brittle crust floating on the upper mantle. Isostasy
The rock record for tens of millions of years indicates that the Earth's magnetic field ____. reverses polarity about every 500,000 years
Seismic P-waves _____ through continental crust relative to oceanic crust. travel slower
The rise of the crust after removal of ice is called ____. crustal rebound
Continental crust is ___ relative to oceanic crust thicker
Because _____ can be accurately calculated, the size and shape of the core can be determined. P-wave paths
The boundary that separates the crust from the mantle is the ____. Mohorovicic discontinuity
The study of ancient magnetic fields is called ____. paleomagnetism
One widely accepted hypothesis is that the Earth's magnetic field is created by electric currents within the ______. liquid outer core
A region of magnetic force, called the ______ surround Earth. magnetic field
A cavity or body of low-density material causes a _____ pull on a gravity meter relative to average crust. weaker
The gradual loss of heat through the Earth's surface is called ___. heat flow
The P-wave shadow zone can be explained by the refraction of P-waves at the ___. core-mantle boundary
A deviation from average reading is called a(n) ____. anomaly
The bending of seismic waves as they pass from one material to another is called seismic ____. refraction
The upper mantle consists of _______. ultramafic rocks
_____ predicts that the higher a mountain range extends above sea level the deeper it extends into the mantle. Isostatic adjustment
A ____ is a tool used to study the gravitational attraction between Earth and a mass within the instrument. gravity meter
A gravity meter registers _____ over ore bodies. increased gravity
Hot mantle rock rising slowly by convection under parts of the ocean explains ____. the unexpectedly high heat flow under the oceans
The ____ is the transition zone at the core-mantle boundary. D layer
The boundary between the core and the mantle is marked by great changes in ____. Seismic velocity, density, and temperature are all correct.
As lava cools below the _____ point, a record of the Earth's magnetic field is permanently trapped in the rock. Curie
_____ is the branch of geology that applies physical laws and principles to study Earth. Geophysics
Iron-nickel meteorites are an important source of information regarding the composition of Earth's ______. core
_____ is a circulation pattern in which low-density material rises and high-density material sinks. Convection
The ____ is a low velocity seismic zone. asthenosphere
Created by: Thomas.Siu