Volcanoes is a thing of beauty and tells us about our past and also impacts our future. Volcanoes eruption occurs when there is a consistent release of energy which is brought to the surface. This energy can also react to earthquakes and gas-emission this emerges at the surface as well. As you go deeper the earth temperature increases as well as depth. The average geothermal of a volcano is two percent to three percent per 100 meters of depth. Volcanoes are opening for there escape of heat. Magma is the cause of volcanoes eruptions. Magma is less intense then solid rock which surrounds the mantle of the earth. The high viscosity of the magma tends to make a taller, steeper and a more explosive volcano. Pyoclastic rock material that escapes from volcanoes as solid fragments. Before 1980 Mount Saint Hellens was a example of stratovolcanoes, although since this enormous eruptions in that year there is now a lava dome growing inside. Volcanoes can be linked as belts and chains as a rift volcano, subduction volcano, and as a hot spot of volcanoes.

Sarah Getsinger & Erin Nalepa

http://magic.geol.edu/~fisher/volcano.html