Here I go dating myself ... I can remember when the topic of Plate Tectonics was brought up on (College) Geology class as "unproven" theory. But the faculty bought into it, it just wasn't quite "respectable" yet.
Geology - Long-Term Global Forecast? Fewer Continents - New York Times
"Forecasts of future continental motion developed slowly as offshoots of the theory of plate tectonics, which won acceptance in the 1960s and 1970s, shattering old dogmas of continental immobility. The theory of plate tectonics holds that the surface of Earth is composed of a dozen or so huge crustal slabs that float on a sea of partially molten rock. Over ages, hot convection currents in this sea, as well as gravitational forces, move the plates and their superimposed continents and ocean basins, tearing them apart and rearranging them like pieces of a giant jigsaw puzzle."
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