Volcanism Chapter 5 - Volcanism Chapter 5 Mount Pelee...

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Volcanism Chapter 5 30/01/2008 21:42:00 Mount Pelee eruption (1902) 28,000 killed in St. Pierre  Eruption of Vesuvias (A.S. 79)…city buried by volcanic ash. Recent eruptions Vesuvius, AD 79 (20000 killed) Krakatoa, 1883: 36,000 killed Mount Pelee, 1902: 28,000 killed Nevada del Ruiz, 1985: 20,000 killed Igneous Rocks: Combine Texture and composition                                                  Composition                 Felsic comes from Ocean crust                             Mafic comes from the mantle                              Felsic             Inermediate       Mafic        Ultra-Mafic                            Hi SiO 2   (Silica)      Si02            Low Si02   Very Low SiO2 Coarse                         (plutonic)             Granite             Diorite           Gabbro          Peridotite Fine                       Rhyolite            Andesite        Basalt            Komatite (Volcanic)                                   Viscosity…by heating something, it has a lower viscosity.  (Put syrup in a microwave, it 
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