| http://www.w3.org/ns/prov#value | - This is a natural phenomenon due to the restriction of oxygen supply by waterlogging and the presence of bacteria which carry out anaerobic forms of respiration where sulphur is the final electron acceptor and is not due to pollution or environmental degradation.When mangrove and other swampy soils are drained, for example, for farming or other development, the oxidation of these sulphides leads t
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