Oil spills are one important factor of marine pollution. Hundreds of millions of gallons of oil end up in the seas every year, and most of these oil discharges are non-accidental. Large spills of oil in the ocean can be devastating, and marine life is heavily affected by this contamination.
Oil spills occur when people mistakenly cause an oil tank to leak into the ocean. Animals are affected by these oil spills because if the oil enters their lungs or livers, the animal will quickly be poisoned by it. Killer whales, Sea Otters, and Sea Birds are now becoming endangered by this pollution problem which is manageable.
The following graph shows the amount of millions of gallons that is thrown into the ocean yearly, worldwide. (http://seawifs.gsfc.nasa.gov/OCEAN_PLANET/HTML/peril_oil_pollution.html)
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