| http://www.w3.org/ns/prov#value | - ary The region where a freshwater river meets an ocean or sea. * Characterized by a halocline (a gradation of salt concentrations). ??? ??? ??? eutrophic lake A lake ecosystem characterized by low O<font face=Arial Sub>2</font> levels, high nutrient levels, and high biological productivity. ??? ??? ??? eutrophication The process by which nutrients, especially nitrogen and phosphorous, accumulate
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