continental crust vs. oceanic crust solar wind
TRANSCRIPT
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CONTINENTAL CRUST vs. OCEANIC CRUST
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Solar Wind
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Earth or Ocean
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How many oceans?
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Continental Drift
Alfred Wegner 1912 German geophysicist
Super continent: Pangea Panathalassa
2 sections: Laurasia
Gondwanaland
Problem with Wegner’s theory:
Finally accepted in : 1960
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Why no one believed him?
1. Wegner said the continents could plow through the continental crust.
2. Said the continents moved because of the gravitational pull of sun and moon.
3. Said the spinning of the earth also caused continents to move.
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Mid Ocean Ridge
Post WW II b/c of sonar use to track submarines
Cmdr. Harry Hess leaves sonar on full time
Mtns. avg 1.5 miles high
Responsible for creating …..
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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
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Fossil evidence
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More evidence• Palm tree fossils found in Arctic regions
• Coral fossils found in present day cold climates
• Maps of continent locations
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Magnetic reversals
Molten rock contains: MAGNETITE
animate
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Sea floor spreading
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Age of the sea floor confirmation
GLOMAR EXPLORER
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Types of ocean sediments: 4Lithogenous
Hydrogenous
Biogenous
Cosmogenous
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Ocean Sediment details
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Project Nekton
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HRE??
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Continental vs. Oceanic
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Divergent Boundaries
Convergent Boaundaries
Plate Movements
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Transform Boundaries
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Continental Margin
Continental Shelf:Gentle angleSm. Pt. of Oceans½ mile – 450 mile wideVERY rich in sea life
Continental Slope:Actual boundary of the continentsVery steep angle
Continental Rise:Where the sedimenthas accumulated
Abyssal Plain:Deep sea floorHas:Hills, guyotsvolcanoes
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Active vs. Passive margins
Steep shelf, slope and there is no riseLots of Earthquake and volcanic activityEx. Western edge of S. American coast
Wide Shelf, gentle slope, long rise, lots of sedimentGeologically inactive b/c no plates are subductingEx. East coast USA
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mid ocean ridge and hydrothermal vents
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• BBC: hydrothermal vents
• BBC: underwater lake
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