VULCANISM

Vulcanism           

Vulcanism or volcanism, refers to the process and phenomena associated with the discharge of molten materials, pyroclastic fragments, or hot water and steam are either intruded (injected) into the earth’s crust or extruded (ejected) onto the surface.

There is difference between vulcanism and volcanism.

Vulcanism involves both intrusive and extrusive igneous activities where volcanism involves only extrusive igneous activities in which materials forced onto the surface.

The molten materials known as magma when it inside the crust also called as lava when it onto the surface of earth.

Magma is the hot molten rock that builds in pressure and explodes from the volcano as lava.

                                           
                                                     Vulcanism diagram