Changes

*A hot, fast-moving and high-density mixture of fine and coarse particles and gas formed during explosive eruptions [[eruption]]s or from the collapse of a [[lava dome]]. (Gardner, et.al., 1995) <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology]</ref> *Lateral flowage of a turbulent mixture of hot gases and unsorted [[pyroclastic material ]] (volcanic fragments, crystals[[crystal]]s, [[ash]], [[pumice]], and [[glass ]] shards) that can move at speed (50 to 100 miles an hour). The term also can refer to the deposit so formed. (Foxworthy and Hill, 1982) <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology]</ref> *A hot (300-800 degrees C (570-1470 degrees F)), dry, fast-moving (10 to more than 100 meters per second (20 to more than 200 miles per hour)) and high-density mixture of [[ash]], [[pumice]], [[rock ]] fragments, and gas formed during explosive eruptions or from the collapse of a lava dome. Moves away from a [[volcano ]] at high speeds. <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology]</ref>