Water Cycle

In the water cycle, water undergoes evaporation, condensation, and precipitation, falling back to Earth clean and fresh.

Sulphur Cycle

  • The sulfur cycle is the collection of processes by which sulfur moves to and from minerals (including the waterways) and living systems.

Steps of the sulfur cycle are:

  • Mineralization of organic sulfur into inorganic forms, such as hydrogen sulfide (H2S), elemental sulfur, as well as sulfide minerals.
  • Oxidation of hydrogen sulfide, sulfide, and elemental sulfur (S) to sulfate (SO42−).
  • Reduction of sulfate to sulfide.
  • Incorporation of sulfide into organic compounds (including metal-containing ....
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