The sulfur cycle

An atmospheric cycle of the biogeochemical cycles

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Volcano's are a natural source of sulfur dioxide.

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Acid rain is associated with large amounts of sulfur dioxide to the atmosphere by human sources.

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simple animation of the sulfur cycle 

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Sulfur dioxide is often produced by point sources such as coal power plants and factories with large furnaces. Fortunately, US SO2 levels have dropped 33% between 1983 and 2002, though in 2005 it was reported that China had risen 27%, to reach levels comparable to the US in 1980.

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Coal is burned through the process of heating and then once burned releases SO2 into the atmosphere (shown above)

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(The process in which sulfur moves through the atmosphere as hydrogen sulfide, sulfur dioxide, and sulfuric acid.)

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An atmospheric cycle, hydrogen sulfide and sulfur dioxide released into the atmosphere from natural and non-natural sources. Acid deposition, sulfur returned to water and soil, taken up by plants, and animals. (Shown above)

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This is a process where sulfur enters the atmosphere through a gaseous state

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This is a simple model of the process of the sulfur cycle and how it is spread through out the earth.