Igneous rocks are formed when magma cools down and solidifies. There are two kinds of igneous rocks and they differ in terms of where magma cools down and solidifies. The two kinds of igneous rocks are: plutonic igneous rock which happens when magma solidifies underneath the crust of the Earth and volcanic igneous rock which happens when magma solidifies on the Earth’s surface.
There are several examples of igneous rocks such as granites which are intrusive rocks that are light colored in appearance – these are used in construction of buildings, Gabbro which are intrusive rocks that are dark colored in appearance, Basalt which are extrusive rocks that are dark-grey colored in appearance – they can also be used in construction and Diorite which are intrusive rocks that are light colored in appearance.
