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rock unit 8C
vocabulary for our science unit
14
Education
4th Grade
11/06/2007

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Term
igneous rock
Definition
rock that forms when melted (molten) rock from Earth's mantle cools and hardens
Term
metamorphic rock
Definition
"new rock that forms when exisiting rocks are changed by heat, pressure, or chemicals"
Term
mineral
Definition
a solid material in Earth's crust that has a definite chemical makeup
Term
sediment
Definition
"sand particles of rock, bits of soil, and remains of once-living things"
Term
sedimentary rock
Definition
rock that forms when sediment settles and is glued together by dissolved minerals
Term
mantle
Definition
thick layer of rock between the crust and the core.
Term
core
Definition
a dense ball with liquid outer part and a solid inner part.
Term
crust
Definition
the outer layer of the earth.
Term
lava
Definition
molten rock that flows onton Earth's surface
Term
magma
Definition
molten rock below the Earth's surface
Term
rock cycle
Definition
continious series of changes that rocks go through
Term
erosion
Definition
movement of rock material from one place to another
Term
weathering
Definition
wearing away of rock into smaller pieces
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