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social studies
Socisl studies flach cards
12
History
6th Grade
02/03/2011

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Term
Seismic wave
Definition
is a vibration that trovles through the earth
Term
Crust
Definition
is the thin layer of solid rock that makes up the outermost part of earth
Term
Mantle
Definition
is the thick layer of solid and molten rock that lies beneath the crust
Term
core
Definition
is the cental part of earth. It lies beneath the mantle and is made up of an outer, liquid part and an inner, solid part.
Term
Lithisphere
Definition
is the rigid outer part of Earth made up of rocks in the crust attached to the upper part of the mantle.
Term
Semimolten
Definition
almost melten; used to describe mantle rock below the lithosphere
Term
asthenosphere
Definition
layer of seninolten mantle rock that lies directly belowthe lithosophere
Term
Magma
Definition
is molten, or melted, rick deep below the surface of earth.
Term
Lava
Definition
rock that flows out onto the surface os Earth
Term
Convective flow
Definition
is the continuous circular pattern of marerials as they are heated and cooled
Term
plate tectonics
Definition
is the theory that earth sutface is made up of separate, rigid plats that move slowly across the mantle
Term
Subduction
Definition
A prosses that occurs when tectinic plates converge and one plate sinks or slides under the other one.
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