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Igneous rocks are formed by the solidification of magma or lava. If the rock solidifies in the Earth's crust it is called a plutonic rock and forms the majority of intrusions or plutons. Small intrusions are called subvolcanic rocks. When lava solidifies on the surface called a volcanic rock.
Magma is subject to various processes before it solidifies. This may change the composition of the magma, and ultimately the composition and type of igneous rock. Examples of plutonic rocks are Granite and Gabbro, subvolcanic rocks Dolerite or Granophyre, and are examples of extrusive volcanic rocks are Basalt, Andesite and Obsidian.
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