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Rocks
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Categories Igneous Sedimentary Metamorphic Petrifaction
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How do you think rocks form?
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Sedimentary Rocks Formed when layers of sediment are pressed together. Pressure and heat cement the layers into solid rocks.
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Igneous Rocks Formed when molten or liquid matter from inside Earth comes to the surface, cools, and hardens.
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Metamorphic Rocks Formed when heat and pressure over long periods of time work to fuse together other kinds of rock.
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Petrified Rock Rock formed when plant or animal remains are replaced with minerals and chemicals.
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