Igneous rocks are formed when magma cools with in the earth. The way it hardens against the other rocks already formed creates the rough texture of the igneous rock.
Metamorphic rocks form when enough heat or pressure on an existing rocks is so much that it causes a chemical or physical change.
Sedimentary rocks are formed when minerals settle at the earths surface within bodies of water.
Above is an illustration of how these three rocks are formed from this web site http://www.knowledgeallocator.com/article/igneous-and-metamorphic-rocks-49.html
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