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                         Sulfur Cycle
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              - Component of protein
                - Cycles in both a gas and sedimentary cycle.
                - The source of Sulfur is the lithosphere(earth's
                - Sulfur (S) enters the atmosphere as  hydrogen
                   sulfide (H2S) during fossil fuel combustion, volcanic
                   eruprtions, gas exchange at ocean surfaces, and
                - H2S is immediately oxidized to sulfur dioxide (SO2)
                - SO2 and water vapor makes H2SO4 ( a weak sulfuric acid),
                  which is then carried to Earth in rainfall.
                - Sulfur in soluble form is taken up by plant roots and
                  incorporated into amino acids such as cysteine. It then
                  travels through the food chain and is eventually released
                  through decomposition.

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