Volcano Pompeii. Before its catastrophic eruption of 1991, Pinatubo was an inconspicuous volcano, unknown to most people in the surrounding areas. Two other examples are the long-dormant Soufrière Hills volcano on the island of Montserrat, thought to be extinct before activity resumed in 1995, and Fourpeaked Mountain in Alaska, which, before its September 2006 eruption, had not erupted since before 8000 BCE and had long been thought to be extinct. The three common popular classifications of volcanoes can be subjective and some volcanoes thought to have been extinct have erupted again. To help prevent people from falsely believing they are not
Devastation Trail and the intensity of the earthquakes also increased. By nightfall, the earthquakes stopped, and the eruption began. The fissure eruption produced fountains of lava which cascaded to the floor of the crater some 100 m below the erupting fissure. Forest fires were also noted. Over the next few days, the lava fountains became higher and higher, eventually reaching a height of more than 500 meters. Erupting pumice started building a new cinder cone that was later named " Puu Puai", (gushing hill). A lava lake also developed on the crater floor. The eruption produced both Pele's hair, the geological term