--->A volcano is a vent that connects the magma chamber to the Earth's surface. The magma chamber of a volcano contains MAGMA, rock made molten by high temperature and pressure within the Earth. As pressure in the magma chamber builds up, it needs somewhere to go and therefore the volcano ERUPTS. After the magma flows out of the Earth's surface, it is called LAVA.
Image Source: www.greenpeace.org
