Why are some Volcanos more violent then othes?

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Volcanic eruptions could be throught as a continuum between two end members. At one extreme, the gentle effusion of Lava. Most Hawiian eruptions would be an exmaple of this. At the other extreme is the explossive ejection of ash from a vent.

The two main factors that influnence how a volcano will erupt are viscosity and gas content. Both are related to the composition of the magma. Hawiian

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