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Potassium argon dating archaeology find

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Did you know? Along with radiocarbon and potassium-argon dating, dendrochronology tree-ring dating is a common technique used by archaeologists. For decades, it was assumed that this was the first species to make stone tools.
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Porn Pics & Movies Potassium argon dating archaeology see Latex The potassium-argon K-Ar isotopic dating method is especially useful for determining the age of lavas. Developed in the s, it was important in developing the theory of plate tectonics and in calibrating the geologic time scale. Potassium occurs in two stable isotopes 41 K and 39 K and one radioactive isotope 40 K. Potassium decays with a half-life of million years, meaning that half of the 40 K atoms are gone after that span of time. Its decay yields argon and calcium in a ratio of 11 to The K-Ar method works by counting these radiogenic 40 Ar atoms trapped inside minerals. What simplifies things is that potassium is a reactive metal and argon is an inert gas:
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