April 7 - Marine Biology Lecture April 7 Plate Tectonics Bathymetry(Chapter2 Physical Oceanography 1 Bathymetry shape of ocean bottom 2 Chemistry

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Marine Biology Lecture April 7 Plate Tectonics, Bathymetry (Chapter2) Physical Oceanography 1) Bathymetry – shape of ocean bottom 2) Chemistry –dissolved constituents in sea water Ocean Basins - Pacific, Atlantic, Artic, Indian, Southern - All oceans are connected, same waters through all oceans - Trench = deepest point in any basin Shape of the Ocean Bottom = habitat for marine life First Theory: Alfred Wegner’s Theory of Continental Drift - Evidence: puzzle piece fit + fossils found on continents that would not be able to make it across oceans Mechanism: - Sea floor spreading (continental layers moving around, floating in upper mantle) - Plate tectonics Mid-ocean ridges – volcanic - boundaries between plates - sea floor spreading happens at ridges o the push between hot and cold
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Sea Floor Spreading 1) Radioactive heat in the Earth’s core 2) Radioactive heat heats up mantle which rises 3) The rising causes expulsion from the ridge 4) Magma is deposited on either side of the ridge and creates new ocean floor
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This note was uploaded on 04/28/2008 for the course BIOL BIOL013 taught by Professor Owen during the Spring '08 term at Foothill College.

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April 7 - Marine Biology Lecture April 7 Plate Tectonics Bathymetry(Chapter2 Physical Oceanography 1 Bathymetry shape of ocean bottom 2 Chemistry

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