CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
Sulphur powder. View of a pile of sulphur powder. Sulphur is a relatively common element, and is present in many rocks and minerals. It has a very important biological role as it is a constituent of all proteins. It is widely used in industry for the production of vulcanised rubber, paints, gunpowder and matches. Burning sulphurous fossil fuels produces the gas sulphur dioxide, which is thought to be a major cause of acid rain.
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