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Eutrophication is the what a water-based ecosystem does when abnormal amounts of nutrients are added to it. Eutrophication is mainly caused because of the two nutrients, phosphorus and nitrogen. These nutrients are normally brought to aquatic ecosystems because of runoff from fertilized agricultural areas, erosion from river banks, river beds, clearing of land (deforestation), or sewage that ends up in aquatic environments. The major consequence of eutrophication are Algal blooms.