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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.
If the magma reaches the surface it is called lava and lava accumulates to make a volcano.   Volcanoes grow by intrusion and extrusion. An intrusion is magma that moves up into a volcano and then it stops, never erupting.This way the volcano grows on the inside. An extrusion is an eruption.es, Most active volcanoes release sulfur dioxide and carbon  dioxide into the atmosphere, which causes air pollution. Some  componetents of volcanic ash may be toxic as wel â¦ l.