67 volume 2 how do we explore multibeam sonar mapping the deep ocean floor 7 8 the noaa ship okeanos explorer education materials collection oceanexplorer noaa gov 2. Mapping the ocean floor. All this evidence both from the ocean floor and from the continental margins made it clear around 1965 that continental drift was feasible and the theory of plate tectonics which was defined in a series of papers between 1965 and 1967 was born with all its extraordinary explanatory and predictive power.
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