Sulfur (also sulphur)

1. A pale yellow nonmetallic element occurring widely in nature in several free and combined allotropic forms. It is used in black gunpowder, rubber vulcanization, the manufacture of insecticides and pharmaceuticals, and in the preparation of sulfur compounds such as hydrogen sulfide and sulfuric acid. Also spelled as sulphur. Volcanic mountains often have of smell of sulfur about them.

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Shown is a fumerole spewing sulfur fumes