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How many oceans?

How many oceans?. Continental Drift. Alfred Wegner 1912 German geophysicist. Super continent:. Pangea. Panathalassa. 2 sections: . Laurasia. Gondwanaland. Problem with Wegner’s theory:. Finally accepted in :. 1960. Why no one believed him?.

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How many oceans?

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  1. How many oceans?

  2. Continental Drift Alfred Wegner 1912 German geophysicist Super continent: Pangea Panathalassa 2 sections: Laurasia Gondwanaland Problem with Wegner’s theory: Finally accepted in : 1960

  3. Why no one believed him? • Wegner said the continents could plow through the continental crust. • Said the continents moved because of the gravitational pull of sun and moon. • Said the spinning of the earth also caused continents to move.

  4. Mid Ocean Ridge Post WW II b/c of sonar use to track submarines Mtns. avg 1.5 miles high Cmdr. Harry Hess leaves sonar on full time Responsible for creating …..

  5. EVIDENCE the CD occurred • Glacial Evidence: • 300 million year old Glacial remains found in India, Africa, Australia, S. America • Whole world covered with ice? These continents used to be located at the north and south poles

  6. Fossil evidence

  7. More evidence • Palm tree fossils found in Arctic regions • Coral fossils found in present day cold climates • Maps of continent locations

  8. Magnetic reversals animate Molten rock contains: MAGNETITE

  9. Sea floor spreading

  10. Age of the sea floor confirmation GLOMAR EXPLORER

  11. Types of ocean sediments: 4 Lithogenous Hydrogenous Biogenous Cosmogenous

  12. Ocean Sediment details

  13. Project Nekton

  14. HRE??

  15. Continental vs. Oceanic

  16. Plate Movements Divergent Boundaries Convergent Boaundaries

  17. Transform Boundaries

  18. Continental Margin Continental Slope: Actual boundary of the continents Very steep angle Continental Shelf: Gentle angle Sm. Pt. of Oceans ½ mile – 450 mile wide VERY rich in sea life Abyssal Plain: Deep sea floor Has: Hills, guyots volcanoes Continental Rise: Where the sediment has accumulated

  19. Active vs. Passive margins Steep shelf, slope and there is no rise Lots of Earthquake and volcanic activity Ex. Western edge of S. American coast Wide Shelf, gentle slope, long rise, lots of sediment Geologically inactive b/c no plates are subducting Ex. East coast USA

  20. mid ocean ridge and hydrothermal vents

  21. BBC: hydrothermal vents • BBC: underwater lake

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