The term of volcanic origin is 'IGNEOUS, ' which refers to rocks and minerals that have been formed by the cooling and solidification of molten magma or lava. IGNEOUS rocks are the most common type of rock found on Earth's surface and make up most of the oceanic crust. IGNEOUS rocks can be further classified into intrusive and extrusive rocks, depending on how they were formed. Intrusive rocks form when magma cools and solidifies beneath the Earth's surface, while extrusive rocks form when magma reaches the surface and cools quickly.