CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
Sulphur. Close-up of a small conical mound of sulphur powder on a reflective black surface. The element sulphur is found abundantly in rocks, esp- ecially in volcanic regions, and is crucial to life, being a constituent of proteins. It is widely used in the manufacture of sulphuric acid (used to treat phosphate rock to make fertilisers) and in making paper, matches, gunpowder and fireworks, in vulcanizing rubber, and in medicines and insecticides.
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