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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.
DA ANSWER IS seafloor spreadinghttp://wiki.answers.com/Q/The_process_by_which_molten_material_adds_new_oceanic_crust_to_the_ocean_floor_is_called http://wiki.answers.com/Q/Th â¦ e_process_by_which_molten_material_adds_new_oceanic_crust_to_the_ocean_floor_is_called. 1 person found this useful.