The term 'Volcano Plume' refers to the cloud of ASH and gas that is emitted from a volcano during an eruption. The crossword solution for this term is 'ASH', which is a three-letter word. ASH is the solid material that is ejected from a volcano during an eruption, and it can be composed of rock fragments, minerals, and volcanic glass. The ASH is carried away from the volcano by the plume, which is a column of hot gas and ASH that rises into the atmosphere.