A volcano an opening, or rupture in the Earths surface which allows scorching hot magma, volcanic ash and gasses to escape from the magma chamber below the surface of Earth. Volcanos are generally found where colosal tectonic plates are diverging or converging.
BIGGEST VOLCANO IN HUMAN HISTORY:
Even though it is not on our planet, Olympus Mons is by far the biggest volcano yet! Also it is the largest mountain in the solar system being 3 times higher than Mount Everest!!!