How Volcanoes Work

 Image Described in Caption
High Lava Fountain -- Molten magma erupts from the Pu'u O'o volcano on the Big Island of Hawaii in 1985. The hot liquid-to-plastic fragments remain incandescent red until they cool and turn dark grey on their descent. Pu'u O'o lies on the east rift system of the Kilauea volcano, Hawaii. Coutesy of the USGS.