(SO42-), derived from the weathering and oxidation of rocks, is taken up by plants and incorporated into sulphur-containing proteins. In this form sulphur is passed along food chains to animals. Decomposition of dead organic matter and faeces by anaerobic sulphate-reducing bacteria returns sulphur to the atmosphere in the form of hydrogen sulphide (H2S). Hydrogen sulphide can be converted back to sulphate or to elemental sulphur by the action of different groups of photosynthetic and sulphide-oxidizing bacteria. Elemental sulphur becomes incorporated into rocks.
             Human Interference : Causes & Consequences
             Over the past century, the world has witnessed rapid population growth, dramatic technological advancement and the rise of industrialization. These events have resulted in activities that have altered the natura
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