From theAncient Greekτέφρα(téphra,“ash”).
tephra (countable anduncountable,pluraltephras)
- (geology) The solid material thrown into theair by avolcaniceruption thatsettles on the surrounding areas.
2004,Richard Fortey,The Earth, Folio Society, published2011, page126:The sky would have darkened with sheer volume of ash, the grapes would have withered upon the vine; misfortune would have fallen with the inexorability of volcanictephra upon rich and poor alike.
2011,Chris Stringer,The Origin of Our Species, Penguin, published2012, page46:Over a five-year research period, RESET is correlatingtephras from their volcanic sources to where they fell in deep ocean and lake sediments, and even further into important archaeological sites in Europe, western Asia and North Africa.
2020 October 5, Ian Randall,Chemistry World[1],Royal Society of Chemistry:Tephra could encourage phytoplankton blooms that could potentially sequester huge amounts of carbon dioxide
