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chapter 4 Plate Tectonics
Section 1 Earth's Interior
8
Science
Not Applicable
09/17/2005

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Term
seismic wave
Definition
a vibration that travels through earth carrying the energy released during an earthquake.
Term
pressure
Definition
The amount of forcepushing on a surface or area.
Term
crust
Definition
A layer of rockthat forms earth's outer surface.
Term
mantle
Definition
The layer of hot,solid material between earth's crust and core.
Term
lithosphere
Definition
A rigid layer made up of the uppermost part of the mantle and the crust.
Term
asthenosphere
Definition
The soft layer of th mantle on which the lithosphere floats.
Term
outer core
Definition
A layer of molten iron and nickel that surrounds the inner core of earth.
Term
inner core
Definition
A dense sphere of solid iron and nickel in the center of earth.
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