Ejecta 4 : Natural Disaster. Material that is thrown out by a volcano, including pyroclastic material (tephra) and, from some volcanoes, lava bombs. (Foxworthy and Hill, 1982)
U.S. Department of the Interior, U.S. Geological Survey, US Geological Society (USGS), Glossary of Volcano and Related Terminology, USGS/Cascades Volcano Observatory, Vancouver, Washington, USA 2006. http://vulcan.wr.usgs.gov/Glossary/volcano_termino logy.html, (ND/ Volc Sci - Amer) {493}