MICHAEL MARTEN / SCIENCE PHOTO LIBRARY MICHAEL MARTEN / SCIENCE PHOTO LIBRARY
Volcanic sulphur deposits (yellow) on the rim of a crater. Sulphur is a common chemical element that is found in the Earth's crust. It is emitted from volcanoes as a gas and as a component of the gases sulphur dioxide and hydrogen sulphide. Sulphur gas forms these solid deposits when it cools, and the toxic hydrogen sulphide gas is oxidised by the atmosphere to form water and sulphur. Photographed on Isola Vulcano, near Sicily, Italy.
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