myuren
Joined: Mar 21, 2003
Posts: 8 (view all)
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Province/State: Ontario
City: Toronto
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What causes water pollution?
April 4, 2003 - 06:13 AM
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The quality of Canada's freshwater and marine areas is affected by three important water pollution problems:toxic
substances,excess nutrients,and sedimentation.
Toxic substances from industrial,agricultural and domestic use are some of the main pollutants in our water.These include trace elements,polychlorinated biphenyls(PCBs),mercury,petroleum,hydrocarbons,dixons,furans and some
pesticides.Some of these substances accumulate through the
food chain rather than break down in the environment.
These substances enter our water in a variety of ways, including:
*industrial sources such as mining,steel production;
*accidents such as oil or chemical spills and contaminated
sites such as the Sydney Tar Ponds in Nova Scotia;
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