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(L16)Oceans_E10

(L16)Oceans_E10 - Oceans GLY 2010 Summer 2010 Lecture 16 1...

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1 Oceans GLY 2010 – Summer 2010 Lecture 16
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2 Voyage of H.M.S. Challenger Route sailed by Challenger from 1872 - 1876
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3 Bathymetry
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4 Seismic Reflection Profile
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5 North Atlantic Ocean
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6 Passive Continental Margins Not located along an active plate boundary Little or no seismic activity and volcanism Found mainly in the Atlantic and most of the Indian oceans Weathering and erosion of continental material produces a wide, thick deposit of undisturbed sediments The coast of Florida is a passive margin
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7 Passive Margin Features Continental Shelf Continental Slope Continental rise
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8 Continental Shelf Gently sloping regions adjacent to continents – about 0.1% on average Built by transport of sediment from the continents to the ocean Much of this material is felsic, and adds to the offshore region of the continent
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9 Continental Shelf Edge of the continental shelf, at about 130 meters depth (average), is in many ways the true edge of the continent Continental shelves are much wider on passive margins (Florida) than active margins (Washington, Oregon), and may be non-existent on some margins
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10 Importance of Continental Shelves 7.5% of ocean surface, but contain much of the wealth of the oceans, including petroleum, natural gas, mineral resources, and huge sand and gravel deposits Contain important fishing resources, although these are largely over-exploited and in danger of failure
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11 Geology of Continental Shelves
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