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Dynamic Earth 3.3

The Three Classes of Rock

TermDefinition
rock A combination of one or more minerals or organic matter is called rock.
composition The makeup of minerals and organic matter the rock contains
texture The size, shape, and positions of the grains that makeup a rock
igneous rock forms when molten rock cools
intrusive igneous rock when magma pushes into the surrounding rock below Earth’s surface and cools
extrusive igneous rock forms after a volcano erupts and lava cools
sedimentary rock forms when layers of sediment pressing on each other
metamorphic rock forms when rocks are exposed to high heat and pressure
foliated metamorphic rock forms with bands or stripes
nonfoliated metamorphic rock forms without bands and made of few minerals
Created by: rippert
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