Where does the word How are intrusive igneous rocks formed and what do they look like? igneous come from? How are igneous rocks formed? How are extrusive igneous rocks formed and what do they look like?

Igneous rocks are one of the three types of rocks found on the earth; others are metamorphic and sedimentary rocks. Igneous rocks are magmatic rocks that are of two types; Intrusive and Extrusive. Intrusive igneous rocks occur as intrusions in the other rocks. Extrusive igneous rocks occur over the surface of the earth. Intrusive and extrusive igneous rocks can be Felsic, intermediate, or mafic in composition.