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Alfred Wegener notices that the coasts of South America and Africa could fit together like a puzzle. He proposed the idea of Pangaea where all land masses were together as one super continent.
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Arthur Holmes elaborated on Wegener's theory that the continents are moved on convection currents in the mantle.
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Seismologists on the U.S. research ship Atlantis found that the sediment layer on the floor of the Atlantic was much thinner than originally thought. They didn't knwo why atthe time, but later study would reveal that sea floor spreading could cause such an occurance.
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In the 1950s the mapping of the ocean floors was undertaken.
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Harry Hess (1962) and R.Deitz (1961) published the sea floor spreading theory after the discovery of the Mid-Atlantic Ridge.
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