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Undo revision 612046 by Conservabuddy (Talk)
Pertaining to fragmented ([[clastic]]) rock material formed by a volcanic explosion or ejection from a [[volcano|volcanic]] [[vent]]. (Foxworthy and Hill, 1982) <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology]</ref>
==References==
<references/>
[[Category:Volcanology]]