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A volcano is a vent, or opening, in Earthâs surface through which molten rock, gases, and ash erupt. The word also refers to the form or structure, usually conical, produced by accumulations of erupted material.
Coal burning is the single largest man-made source of sulfur dioxide. Nitrogen Oxide Major Sources: - Fuel combustion in power plants and automobiles-Processes used in chemical plants. Source(s): http://www.corrosion-doctors.org/AtmCorr... http://www.envirotools.org/factsheets/co...oxic amounts of sulfur dioxide can be released from the preservative chemical metabisulfite in the presence of water and acid. A major direct source of nitrous oxide from agricultural soils is that of synthetic fertilizer use.