Occurs in large deposits as yellow crystals. It is stable in air and water but will burn if ignited, giving off the acrid gas, sulfur dioxide, its most famous compound, which is used to make sulfuric acid, the single most important industrial chemical. Sulfur dioxide is also produced when coal and oil are burned and is thought to be responsible for so called 'acid rain'.
Sulfur is essential to all living things and there is a sulfur cycle in nature.
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