Changes
link to de-orphan
Pertaining to fragmented ([[Clastic Sedimentary Rock|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==