Did you know that inside a volcano the lava that comes out is red hot magma? When the Earth cracks it awaikens a volcano which causes it to erupt. In 79 A.D. , Mt. Vesavius killed over a thousnd people, who thought it was just a moutain. Mt. Vesavius buried the people. The bodies lay undiscovered for 1,700 years. Mauna Loa, Hawaii, is the world’s largest volcano. There are many underwater volcanoes . There are also volcanoic lakes. There are rivers of fire that are actually really interesting.