| − | In a '''Pelean''' or "Nuee Ardent" (glowing cloud) [[volcanic eruption|eruption]], such as occurred on the [[Mayan Volcano]] in the [[Philippines]] in 1968, a large quantity of [[gas]], [[dust]], [[ash]], and [[incandescent]] [[lava]] fragments are blown out of a central [[crater]], fall back, and form tongue-like, glowing [[avalanche]]s that move down-slope at velocities as great as 100 miles per hour. Such eruptive activity can cause great destruction and loss of life if it occurs in populated areas, as demonstrated by the [[devastation]] of [[St. Pierre]] during the 1902 eruption of [[Mount Pelee]] on [[Martinique]], [[West Indies]]. <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology (Tilling, 1985)]</ref> | + | In a '''Pelean''' or "Nuee Ardent" (glowing cloud) [[volcanic eruption|eruption]], such as occurred on the [[Mayan Volcano]] in the [[Philippines]] in 1968, a large quantity of [[gas]], [[dust]], [[ash]], and incandescent [[lava]] fragments are blown out of a central [[crater]], fall back, and form tongue-like, glowing [[avalanche]]s that move down-slope at velocities as great as 100 miles per hour. Such eruptive activity can cause great destruction and loss of life if it occurs in populated areas, as demonstrated by the devastation of [[St. Pierre]] during the 1902 eruption of [[Mount Pelee]] on [[Martinique]], [[West Indies]]. <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology (Tilling, 1985)]</ref> |