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1596-Abraham Ortelius first suggested continents were joined.1912-Alfred Wegener proposes Pangea w/out driving forces1929-Arthur Holmes proposes convection a s driving force1950s-Oceanographic vessels map the oceanic basin's features1960-Harry Hess/Dietz develop seafloor spreading1963-Vine&Matthews/Morley propose magnetic polaritymid 1960s-sensors instaled to record hydrocousic/earthquake activity1968-Glomar Challenger discovers that rocks close to MOR are younger than rocks farther awaymid 1970s-seismic tomography allows them to make 3D models of Earth's interior
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