Marine pollution

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  • Publicado : 30 de noviembre de 2010
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English

Marine pollution

11 – mayo – 2010

WHAT DOES POLLUTION MEANS?
Pollution is the addition to the ecosystem of something which has a detrimental effect on it.
DIFFERENT KINDSOF POLLUTION
1. Air Pollution.
2. Marine Pollution.
3. Land Pollution.
MARINE POLLUTION
The world's oceans can be divided into two zones: coastal and open. The coastal zoneconstitutes about 10% of the total ocean area and is the receptacle for wastes from rivers, direct run-off from the land, oil spills, and ocean dumping. When pollution occurs in marine waters, it is mostlikely to be observed first in the coastal waters, and its effects are likely to be serious there. The deep waters of the open ocean, usually 300 feet (91 meters) or more in depth, are mostly out ofcontact with coastal water and surface waters. The mixing of the deep and surface waters may take hundreds, even thousands of years, depending on the basin involved. Much of the manmade wastes dispersed tothe open ocean: litter, plastics and oil slicks, are still in surface waters; but DDT and other chlorinated hydrocarbons are found in open ocean organisms; and radioactive isotopes of strontium andcaesium from nuclear bomb detonations can now be found at depths of 1,000 meters.
The oceans are so vast and deep that until fairly recently, it was widely assumed that no matter how much trash andchemicals humans dumped into them, the effects would be negligible. Proponents of dumping in the oceans even had a catchphrase: "The solution to pollution is dilution."
SOURCE MARINE’S POLLUTION.Pollution is the introduction of harmful contaminants that are outside the norm for a given ecosystem. Common man-made pollutants that reach the ocean include pesticides, herbicides, chemical fertilizers,detergents, oil, sewage, plastics, and other solids. Many of these pollutants collect at the ocean's depths, where they are consumed by small marine organisms and introduced into the global food...
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