class 9 - Submarine Canyon Grand Canyon 2 Turbidity...

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2 1 OCE1001 Elementary Oceanography Fall 2011
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2 Reading Assignments Reading for Exam 1 Introduction, Appendices 1, 2, 3 Ch 1: Planet Earth Ch 2: Plate Tectonics Ch 3: Marine Provinces Ch 4: Sediments (112-115; 122-125) Ch 16: Climate Change
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2 Probing the Ocean Floor Echo sounding and seismic reflection Chapter 3: Marine Provinces
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2 Echosounding Record
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2 Seismic Profiling
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2 Side-Scan Sonar
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2 SCUBA Diving
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2 Mapping the Sea Floor Very Incomplete! USS San Francisco ran into a seamount in the SW Pacific in 2005 Depth soundings in the S. Pacific Ocean compared to the continental U.S.
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2 3 Divisions of an Ocean Floor (1) (2) (3) (1) (2)
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2 Geologic Features of an Ocean “Passive Margin” “Active Margin” How Volcanoes Form (Nat’l Geographic)
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2 (1) Continental Margins
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Submarine Canyons How did submarine canyons form?
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2 Monterey
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Unformatted text preview: Submarine Canyon Grand Canyon 2 Turbidity Currents 2 Grand Banks Earthquake (1929) Analysis of cable breaks showed that a turbidity current must have had speeds up to ~80 km/hr… 2 (2) Deep-Ocean Basins Guyots or “tablemounts” are flat-topped seamounts, very common in the SW Pacific Ocean 2 Abyssal Plains 2 Major Trenches Common in Pacific, uncommon in Atlantic, Indian Oceans 2 Peru-Chile Trench 2 (3) Mid-Ocean Ridges 2 Hydrothermal vents Is this really smoke?? WHOI: Hydrothermal Vents video 2 Hydrothermal vents • Metal sulfide deposits • Unusual biological communities – Survive without sunlight – Bacteria oxidize H 2 S gas to provide food 2 Exam #1; Thursday, Sept. 29 We will go over the exam format and the subject matter distribution of the questions in class on Tuesday…...
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class 9 - Submarine Canyon Grand Canyon 2 Turbidity...

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