Igneous Rocks Volcano World

Igneous Rocks igneous rock Igneous rocks form when magma, or melted rock from inside the Earth, cools and hardens They can form above ground when magma erupts from a volcano as lava rocket 878 Granite This is a hard igneous rock made up of clearly visible crystals of various minerals Granite looks good when it is polished and because it is also a

blackrock An ultramafic, coarse-grained igneous rock Peridotite will form under Earth's surface from slowly-cooling magma It is less rare than Komatiite,