eutrophication
noun/ˌjuːtrəfɪˈkeɪʃn/
/ˌjuːtrəfɪˈkeɪʃn/
[uncountable] (specialist)- the process of too many plants growing on the surface of a river, lake, etc., often because chemicals that are used to help crops grow have been carried there by rain
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eutrophication