Volcanic emissions are the gases, ASHES, ejecta, and FUMES released during a volcanic eruption. Gases are the most abundant type of emission, consisting of water vapor, carbon dioxide, sulfur dioxide, and other compounds. ASHES are made up of tiny particles of rock and glass that are blasted into the air during an eruption. Ejecta is material that is thrown out of the volcano during an eruption, such as lava, rocks, and ash. FUMES are the smallest particles of volcanic material, which are created when molten rock is blasted into the air and cools quickly.