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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.
Tufa (also called tuff) is a type of volcanic stone. Massive volcanic explosions send millions of tons of ash into the air, which then settles in layers downwind.Over a long time, these ash layers are compressed into tufa, a light and porous volcanic stone.ufa (also called tuff) is a type of volcanic stone. Massive volcanic explosions send millions of tons of ash into the air, which then settles in layers downwind.