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Rocks

Unit 2 part 2

TermDefinition
compaction to exert force on something or compress it to make it more dense.
pressure A force applied per unit of area of a surface.
rock A naturally formed solid that is usually made up of two or more minerals.
rock cycle The set of natural processes that form, change, break down and reform rocks.
igneous rock Forms when molten rock cools and becomes solid.
Metamorphic rock Forms when heat or pressure causes older rocks, to change into new types of rocks.
Sedimentary rock Forms when pieces of older rocks, plants and other loose material get pressed or cemented together.
sediment Materials, such as sand, that settle out of water or air.
ore a rock from which a valuable mineral can be extracted.
intrusive igneous rock igneous rock that is formed from magma cooling within the earth's crust.
extrusive igneous rock igneous rock that is formed from lava cooling on Earth's surface.
metamorphism The process by which rock is changed by heat and/ or pressure.
recrystallization The process by which heat and pressure break the chemical bonds in minerals and then the atoms rejoin in a different way forming a new substance.
Created by: rdooley
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