9.12.06 - Lithospheric Plates Asthenosphere-viscous...

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9/12/06 Lithospheric Plates Asthenosphere -viscous fluid -resistant to flow Islands/Continents drifting through the ocean -Theory of Continental Drift (Alfred Wegener 1880-1930) Marsupials Australia and South America Lungfish Africa and the Americas Seed fern Americas and India Glacial deposits found at low latitude – fossil glaciers PANGEA Atlantic Ocean -mid ocean ridge -plate tectonics -new crust forms at ridge -sea floor spreading (spreading centers) -subduction Plate Tectonics - new crust forming o sea floor spreading o spreading centers - subduction o one plate sinks beneath another as they come together - uplift o mountains are created when two continental plates come together - transform fault o two plates sliding past each other Evidence for Plate Tectonics - Topography o Relief Mountains/ridges - Paleomagnetism - Sea floor spreading rates - Seismicity and Volcanism 7 Major Lithospheric Plates - Pacific Plate - North American Plate
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9/12/06 - South American Plate - African Plate
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9.12.06 - Lithospheric Plates Asthenosphere-viscous...

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