Human Impact on Oceans. About 37% results from a mix of materials and wastes which make up urban run-off and the discharge from land - based industrail.

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Presentation transcript:

Human Impact on Oceans

About 37% results from a mix of materials and wastes which make up urban run-off and the discharge from land - based industrail plants. These materials reach the sea through storm water drains, sewage outfals, creaks and rivers. oilismastery.blogspot.com/2008/08/third-oil-f...

About seven percent is oil which seeps naturally out of fissures in the sea bed. Oil on the beaches of South Australia and Western Victoria, for instance, was first noticed by European settlers during the early 1800s. Now it is known to come from cracks in the ocean seabed and is particularly noticeable after earthquake in the region. Scientists find more oil fissures in Lake Baikal's bedrock

About 14 percent of the oil in the sea is directly responsible by the world's oil industry. This occurs in spills during the exploration and production phase from rigs and platforms, and accidents involving oil tankers. About 33 % occurs during the operation of vessels other than those used by the oil industry. Usually these are cargo vessels which may be involved in collisions which spill fuel oil or they may discharge waste oil from ballast tanks during a trip. About 9 % of oil in the oceans is absorbed from the atmosphere

Natural disasters can also cause of oil spills. For example, Huricane Katrina was responsible for the release of more then 7 million gallons of oil into the ecosystem, from oil storage facilities, processing plants, and pipelines. In 2007, flooding in Kansas caused over 40,000 gallons of crude oil from a refinery to spill into flood waters, threatening both the local ecosystem and drinking water. Ilegal dumpers where will dump crude oil into the oceans because they do not want to spend money on decomposing their waste oil. Because they won’t spend money on breaking up the oil (decomposing it) they will dump oil into the oceans, which is illegal.