Plate Tectonics and the Ocean Floor. Continental Drift. Theory proposed by Alfred Wegener in 1912 Continents once formed a single landmass. Early Evidence. Age of Oceanic Crust. Courtesy of www.ngdc.noaa.gov. Paleomagnetism. Plate Tectonics – 1960’s. Explains HOW the plates moved.
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the Ocean Floor
Courtesy of www.ngdc.noaa.gov
- thin (~7 km)- dense (sinks under continental crust)- young
Above: View of the San Andreas transform fault
Volcanism is mostly focused at plate margins