Fallout 04 : Nuclear Energy and Nuclear Disasters. A general term for all the?ash?and debris that falls to earth (also known as?ashfall) from an eruption cloud
U.S. Geological Survey, U.S. Department of the Interior, Volcano Hazards Program, Glossary, Washington, DC, USA 2011. http://volcanoes.usgs.gov/vsc/glossary/alluvium.ht ml, (ND/ Volc Emr - Amer) {795}