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[[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>

[[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 name="gloss">[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 name="gloss" />

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>

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 name="gloss" />

 

Pyroclastic flows are arguably the most dangerous of all volcanic flows, due to their fast speed and destructive power.

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