I. Introduction Volcano: defined is a mountain or hill formed by the accumulation of materials erupted through one or more openings (called volcanic vents) in the earth's surface. The term volcano can also refer to the vents themselves. Most volcanoes have steep sides, but some can be gently sloping mountains or even flat tablelands, plateaus, or plains. The volcanoes above sea level are the best known, but the vast majority of the world's volcanoes lie …
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…of volcanic gases, crater lakes, and trying to determine the temperatures that lava had at the time they were erupted even long after the eruption has ended. Bibliography Bibliography 1999 Microsoft Encarta; Volcanoes 1980 USGS; www.vulcan.wr.usgs.gov 2000 Volcano World; http://volcano.und.nodak.edu/vwdocs/frequent-questions/grp13/question1544.html 1980-2000 USGS; www.vulcan.wr.usgs.gov/photo/volcanoes/MSH/framework.html 1993-2000 Microsoft Corporation; various volcano media 2000 FEMA; www.fema.gov/library/volcanof.htm