What is the role of microorganisms in the sulfur cycle?

The cycle of the sulfur cycle extends to water, soil, atmosphere. The key links in the cycle are the oxidation of hydrogen sulfide to sulfate, as well as the reduction of sulfate to hydrogen sulfide. The above reactions are carried out by aerobic and anaerobic groups of bacteria. A special position in the sulfur cycle is occupied by thionic bacteria, which are widespread in the kidney, in water bodies, and in rocks. These bacteria use hydrogen sulfide, thionic acids, sulfides, or molecular sulfur as a source of oxidation.