The formation of a volcanic eruption is a dramatic series of events., First of all, most volcanoes are formed where two plates collide. , Then one of the plates is forced under the other and sinks., As the plate sinks, friction and the earth's heat cause part of it to melt., In time, this melted part rises as magma., The magma produces heat, steam, and pressure., When the heat, steam, and presure from the magma finally reach the surface of the Earth, a volcano eruption occurs.

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