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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.
What factors help determine whether a volcanic eruption will be violent or relatively quiet? Â· It is determined by the primary factors of the magma's Temperature, its Composition, and the amount of Dissolved Gases it contains.