Water a good solvent for many materials and even some articles that do not dissolve the form suspensions colloidal-like solutions. And go down the water in the form of rain or snow snow in pure virtually free of bacteria or other pollutants, but as a result of the development of large industrial exposed to many pollutants, making it fit for drinking. Examples of pollution, acid rain, as well as sewage and industrial and agricultural.
In the past, people were throwing waste and waste water in the rivers and the ocean, thinking she purifies herself in between 1849 and 1853 spread the cholera epidemic in London due to contamination of the River Thames has led to the death of a large number of residents of London and its environs. And repeated the same tragedy in other European cities as it has in some American cities and typhoid epidemic in the same period.
And also a pollution of sea water, rivers and groundwater petroleum materials, radioactive materials, heavy metals and others. The Oil Pollution a threat to the water, where a thin layer above the water surface to prevent penetration of air and carbon dioxide and light to the water, thus becoming the aquatic life almost impossible. The duration of the hydrocarbons produced from oil pollution in the water long and integral part bacteria and accumulates in the bottom of the sea. The oil contains carcinogenic substances such as carcinogenic benzopyrene benzopyrene which there is a high proportion of oil in the Gulf and Libya, and affect the plants and animals that feed on them.
There are other chemicals causing water pollution, pesticides such as DDT, as well as heavy metals.
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