Igneous rocks are among the major types of rocks, that are formed when magma or molten rocks found on the underneath of the surface of the earth, rise up, cool down and then solidify.
Igneous rocks may either be extrusive or intrusive rocks.
Intrusive rocksare types of rocks that are formed when magma cools down and solidifies under the earth's surface, resulting to rocks.
Extrusive rocks results when magma solidifies over the surface of the earth.
