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Igneous Rocks By Mrs. Hicks What is an igneous rock? An igneous rock is a rock that is created by a volcano. Some rocks cool quickly and are very shiny. Obsidian Other rocks cool as they fly through the air and release lots of air, causing lots of holes. Scoria Where are igneous rocks formed? Igneous rocks form when magma pours out of a volcano as lava and cool. Check out Igneous rocks Granite
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