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The idea that the seafloor itself moves (and carries the continents with it) as it expands from a central axis was proposed by Harry Hess from Princeton University in the 1960s.t the Mid-Atlantic Ridge (and in other areas), material from the upper mantle rises through the faults between oceanic plates to form new crust as the plates move away from each other, a phenomenon first observed as continental drift.
Alfred Wegener, the pioneer of continental drift, thought that the continents as plates move through the oceanic crust, implying thus that the shorelines of the continents are the margins of the continental plates.