B.A., Earth Sciences, University of New Hampshire Developed in the 1950s, it had been crucial in developing the idea of dish tectonics plus in calibrating the geologic time scale. Potassium-Argon Fundamentals Potassium happens in 2 stable isotopes ( 41 K and 39 K) plus one isotope that is radioactive 40 K). Potassium-40 decays by having
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