Water pollution is contamination of water by foreign matter that deteriorates the quality of the water.Water pollution covers pollution in liquid forms like ocean pollution and river pollution.As the applies,liquid pollution occurs in the oceans,lakes,streams,river,underground water and bays in short liquid-containing areas.
It involves the release of toxic substances,pathogenic germs,substances that require much oxygan to decompose,easy-soluble substances,radioactive that bocome deposited upon the bottom and their accumulation will interfere with the conition of aquatic ecosystems.
For examples,the eutrophication lack of oxygen in a water by axcessive algae growths because of enrichment of pollution.