| Harry hess plate tectonics |
The seafloor spreading hypothesis was proposed by the American geophysicist Harry H. Hess in On the basis of Tharp’s efforts and other new discoveries about the deep-ocean floor, . |
| Edward seuss plate tectonics |
In the early s an Austrian geologist, Edward Suess, suggested that the long cooling period of early Earth caused the planet to contract over time. |
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Geologist Harry Hess *31 saw that convection currents from deep within the earth provided the driving force behind continental drift. |
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Harry Hammond Hess, a professor of geology at Princeton University, was very influential in setting the stage for the emerging plate-tectonics theory in the early s. |