2. There are three main factors that determine the nature of volcanic eruptions. Each factor has defined characteristics that can determine the effects of the volcano. The factors are the magma's composition, temperature and the amount of dissolved gases. Each of these affects the magma's viscosity, which is directly related to the nature of the eruption. The amount of silica content is directly related to the viscosity, as well. The composition of Mafic magma is about 50% silica, w
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