Thursday, November 18, 2010

Composite Volcanoes



     Composite volcanoes also known as stratovolcanoes make up some of the most know volcanoes that we have here on earth. A composite volcano is made up of many layers of harden lava and volcano ash of eruptions that have already taken place. That is usually why they can make such peaks that they have because of the constant overlapping that occurs. They really make beautiful mountains and draw people close to them and that usually isn’t good because when these volcanoes blow they are usually violent and have a higher number of casualties than other volcanoes.
            Like said before composite volcanoes are made of an overlapping of lava that comes out when there is an explosion. All the lava that comes out during like miner explosions usually doesn’t get to far so what is left just keeps getting piled and piled on top of each other. While the lava keeps piling up this is what causes for the high steep tops of these volcanoes. Also during these eruptions cinder bombs and blocks are thrown out and so when the next eruption occurs the lava flows cement these all together also adding height to the volcano.

These volcanoes mostly always have a violent eruption. The eruption is caused by the viscous magma, when it rises to the top it usually clogs up the crater pipe and gases in the crater pipe get lock up. So the pressure will increase and the magnitude of the eruption. During these eruptions the volcanoes will throw out debris, have lots of lava flow they can also causes landslide, avalanches and even tsunamis. The eruptions of these volcanoes cause the most damage than any of the rest. Some of the most well know volcano eruptions are from composite volcanoes like Mt. St Helens, Mt.Fuji and Mt. Etna.




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