There are two types of sources for the nutrients and sedimentary materials: point and nonpoint.
Point and non-point are a category which is classified into:
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Eutrophication means nutrient enrichment which all water bodies undergo during their lives. Eutrophication results in lowering of water quality for domestic and recreational uses, following discharge of wastes containing some nutrient salts into water bodies.
The problems do not come from the nutrients themselves but from the changes induced in the aquatic productivity. The most important nutrients that cause eutrophication are nitrates and phosphates from fertilizers. Primarily some of the causes of sea pollution are: Eutrophication is the process of enriching an ecosystem with nutrients, primarily nitrogen and phosphorous. It can occur naturally in aging lakes. Humans can also introduce these nutrients into an ecosystem, at which point it is called artificial eutrophication.
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