The water cycle is when the rain water to Earth flows through agricultural areas, livestock, plant. Houses will bring the manure fertilizer waste water, including various pollution of waste, these will flow into the sea are of single-cell organisms, such as phytoplankton by fertilizers that cause major problems, namely, nitrogen, and phosphorus. When the phytoplankton increased Plankton Bloom will occur until the Eutrophication phenomenon or phenomena, sea change, like in Thailand will find that most will Bloom as scintilans in Noctiluca, balanced ecosystem, there will be animal plankton. Control the amount of phytoplankton, but when a crisis of excessive nutrients in the water exceed the ability of animal plankton. The occurrence of many creatures of this crowded, often conveying diseases and death. Bacterial degradation of these creatures will add lots more quick individual oxygen in water, the greater the poorer Hypoxia further downturns.
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