Similar to a [[pyroclastic flow ]] but of much lower [[density ]] (higher gas to rock ratio). (Gardner, et.al., 1995)
Turbulent, low-density cloud of hot rock debris and gases that moves over the ground surface at high speed. <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology]</ref>
==References==
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