Science How does a volcano erupt ? Asked by arwen46 12 years ago 1/31/2013 2:01 AM Last updated by anonymous 12 years ago 2/1/2013 6:24 PM
Presure and high temperatures liquify the rock deep within the Earth. Because of the extreme pressure it is forced upward. When there is a weak spot in the Earth's crust this magma is released in the form of a Volcano.