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blue world
Marine pollution usually refers to human beings to change the original state of the ocean, so that the destruction of marine ecosystems.
Harmful substances into the marine environment caused by pollution. Biological resources can damage and endanger human health, hindrance to fishing and other human activities at sea, damage to water quality and environmental quality.
Marine pollutant according to sources, the nature and toxicity, can be divided into the following categories: ① oil and its products (see the marine oil pollution). ② metals and acids, alkalis. Including chromium, manganese, iron, copper, zinc, silver, cadmium, antimony, mercury, lead, metals, phosphorus, arsenic and other non-metallic, as well as acid and alkali and so on. They directly harm marine life and affect their value.③ pesticides. Mainly by the runoff into the ocean. Hazardous to marine life. ④ radioactive substances. Mainly from nuclear explosions, the nuclear industry or nuclear ship sewage. ⑤ organic waste and domestic sewage. By runoff into the ocean. A very serious red tide formation. ⑥ thermal pollution and solid waste. Include industrial cooling water and engineering soil residues, garbage and mud, such as dredgingThe former into the sea to raise the local area after the water temperature, dissolved oxygen content so that reduced the impact of biological metabolism, and even changes in biological communities; the latter may undermine the coastal environment and marine life habitat