Igneous rocks are formed by the solidification of the magma and can be called in different ways, depending on the composition and the location where the magma has cooled and solidified to form them. In that case, igneous rocks can be intrusive or extrusive.
They are considered intrusive when the magma cools and solidifies inside the earth, like granite, for example.
They are considered extrusive when the magma cools and solidifies on the earth's surface, such as basalt, for example.
