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Sulphur is found in meteorites, volcanoes, hot springs, and as galena, gypsum, Epsom salts, and barite.
Sulphur dioxide is a dangerous component in atmospheric air pollution and is one of the factors responsible for acid rain.
In the Frasch process underground deposits of sulphur are forced to the surface using superheated water and steam (160°C, 16 atmospheres, to melt the sulphur) and compressed air (25 atmospheres).