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Dynamic Earth 3.3
The Three Classes of Rock
Term | Definition |
---|---|
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 |