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The primary eruption characteristic used to determine the volcanic explosivity index is the volume of pyroclastic material ejected by the volcano. Pyroclastic material includes volcanic ash, tephra, pyroclastic flows, and other types of ejecta.
A volcano is an opening in the earth's crust that allows molten rock from the mantle to flow out onto the surface as lava. Volcanoes also emit vast amounts of gas, primarily carbon dioxide, water vapor and sulfur dioxide.s the subducting plate plunges into the mantle, it becomes heated. When it reaches the asthenosphere or thereabouts, subducted water in the descending slab of crust lowers the melting temperature of the rock and a molten rock mixture forms. This hot, buoyant magma forces its way upward through the overriding crust.