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Published bySharlene Cross Modified over 9 years ago
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Eight Grade Science
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FishingFishing Shipping Oxygen ProductionShippingOxygen Production Ocean Resources TourismTourism Climate BufferMiningClimate BufferMining
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Fishing Fish supply about 16% of the world’s protein. Methods – nets, trawlers, longlining, gillnetting, diving
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Fishing Gillnetting Longlining Trawling
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Fishing 60% of fish are used to feed people 40 % are used food for fish on fish farms and other fish in captivity and fish oil
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FishingFishing – Our Impact Over fishing – we have caught too many fish We need to determine the “carrying capacity” of the ocean – how many of each type of fish should there be? We need to develop sustainable fishing practices – fisheries are limited in how many fish and what size of fish they can catch Habitat destruction Pollution
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Shipping “moving cargo with ships between seaports” Ships used include: Tankers Container ships Cable layers Ferries Car carriers Barges
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Shipping Should be low impact but… Accidents happen Pollution from ships – air and water Organisms are carried to new habitats in ballast water and introduced into new habitats Ships can hit animals
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Tourism Provides a great deal of income world wide – in the use $478 billion Problems: Construction of resorts destroys habitat Pollution (sewage) Activities destroy habitats Overexploitation of local seafood
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Mining Provides – diamonds, gold, silver, and manganese Destroys ecosystems – sediments are dredged up, killing animals living in it and interferes with photoplankton
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Climate Buffer The ocean holds and circulates water and heat. The ocean and atmosphere interact to produce weather – the air gets heat and moisture from the oceans Air temperatures worldwide are regulated by the circulation of heat by the oceans
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Oxygen Production Phytoplankton provide as much as 90% of the world’s oxygen – Some is dissolved into the ocean water Some goes into the atmosphere
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Tidal and Wave energy The movement of water, both by tides and waves can be harnessed to generate electricity.
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