火山爆發既energy change (過程)

Of magma and other volcanic ejecta are within a short time from the crater to the surface release. As the magma contains a large number of volatile, combined with the confining pressure of overlying rock layers so that these volatile dissolved in the magma can not overflow, when magma rose close to the surface, the pressure decreases, volatile matter is released rapidly, so the formation of volcanic eruptions. Volcanic eruption is an unusual geological phenomenon is a manifestation of crustal movements, but also the Earth's internal heat on the surface of one of the most intense display