The sulfur compounds with metals – sulfides – located deep in the soil and in marine sedimentary rocks, are converted by microorganisms into an accessible form – sulfates, which are absorbed by plants. With the help of bacteria, individual reactions of oxidation – reduction are carried out. Deep-lying sulfates are reduced to H2S, which rises and is oxidized by aerobic bacteria to sulfates. Decomposition of the corpses of animals or plants ensures the return of sulfur to the cycle.
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