Sulfur cycle

1. Sulfur Cycle Sedimentary and Gaseous

2. Sedimentary cycle Weathering of rock and leaching of its minerals, transport, deposition and burial. Gaseous Cycle A biogeochemical cycle with the main reservoir or pool of nutrients in the atmosphere and ocean

3. Sulfur enters the biosphere through Natural Activity Weathering of rocks and decomposition Carried through terrestrial environments in salt solution. Plants Consumers

4. Sulfur enters the atmosphere through Natural Activity Volcanic eruptions, gases released by decomposition Human Activity Burning of fossil fuels, acidic drainage from mines Enters atmosphere as H 2 S and reacts with oxygen to form SO 2

5. SO 2 is soluble in H 2 O Acid rain (H 2 SO 4 ) plants consumers

6. Death of consumers Sulfur to the atmosphere soil Ponds, lakes, seas and oceans

7. Different kinds of bacteria process this sulfur Non-photosynthetic photosynthetic Colorless sulfur bacteria Purple bacteria Green bacteria

8. Sulfur Iron Ferrous sulfide (FeS 2 )

9. Sulfur from the oceans Released in the atmosphere as Dimethyl sulfide ((CH 3 ) 2 S ) Go back to the atmosphere by bacteria fixation, or sea sprays