The blast of mountain is still not understand clear. Geologists estimate that there are heat accumulation greatly area. The magma, steam and gas accumulation control more and more, which produces a pressure. High heat, at one point it will explode. The rate of violence of the explosion. Depending on the severity of the explosion. As well as depending on the pressure of steam, and the viscosity of the lava. If the lava concentrate. The rate of severe explosion is very intense along time, volcanic, not only the lava flow. The gas steam dust ash. Out, look into the smoke rolled down. The steam condenses into water, bring the dust ash, falling together. Runoff into mud flood in the foothill area low down. If the volcano have snow cover. It will melt the snow brings a lot of mud, such as in the case of plague in Colombia recently.
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