Igneous rock: a rock that forms when hot, liquid rock material cools and hardens into a solid.
Sedimentary rock: a rock that forms from pieces of other rocks that are squeezed or cemented together.
Metamorphic rock: a rock that forms from another kind of rock that is changed by heat or pressure or by a chemical reaction.
Rock cycle: rocks continually changing from one kind into another in a never-ending process.
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