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Geophysicist and oceanographer Robert S. (Robert Sinclair) Dietz (1914-1995) from Scripps Institution of Oceanography, among many of his achievements set forth a theory of seafloor spreading, the process in which new crustal material continually up-wells from the Earth's depths along the mid-ocean ridges and spreads outward at a rate of several centimeters per year. Circa 1984.

Geophysicist and oceanographer Robert S. (Robert Sinclair) Dietz (1914-1995) from Scripps Institution of Oceanography, amo...