Changes

A hot, fast-moving and high-density mixture of fine and coarse particles and gas formed during explosive [[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>

[[Image:Pyroclastic_flow.jpg|thumb|300px|Pyroclastic flow sweeps down the side of Mayon Volcano, Philippines,  during an explosive eruption on 15 September 1984. Note the ground-hugging cloud of ash (lower left) that is billowing from the pyroclastic flow and the eruption column rising from the top of the volcano.]]A hot, fast-moving and high-density mixture of fine and coarse particles and gas formed during explosive [[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, [[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>

Lateral flowage of a turbulent mixture of hot gases and unsorted [[pyroclastic material]] (volcanic fragments, [[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>