This page discusses igneous rocks, detailing their formation from molten material, classification as intrusive or extrusive, and mineral composition. It highlights types such as felsic, mafic, and ult...This page discusses igneous rocks, detailing their formation from molten material, classification as intrusive or extrusive, and mineral composition. It highlights types such as felsic, mafic, and ultramafic, and notes their common uses in construction, tools, and art. The lesson also emphasizes the distinctions in crystal size and composition among different igneous rocks.