Volcano Fallout is a term used to describe the ASH, dust, and other debris that is ejected into the atmosphere during a volcanic eruption. The term 'ASH' is an acronym for the three main components of this fallout: ASH, Silica, and Halogens. ASH is the most abundant component, consisting of small particles of rock and glass created by the intense heat of the eruption. Silica is a mineral found in volcanic rocks, and Halogens are elements such as chlorine, fluorine, and bromine that are released during the eruption. Together, these three components make up the majority of the material ejected into the atmosphere during a volcanic eruption.