Radiometric Dating - In this case about 1.25 billion years...

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Radiometric Dating Elements have isotopes which are unstable i.e. radioactive. Take Potassium…0.011% of all Potassium is K-40, which is radioactive. It spontaneously changes in to Argon-40 in a process called radioactive decay. The time it takes half the amount of a radioactive isotope to decay is called its half life.
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Unformatted text preview: In this case about 1.25 billion years By knowing rock chemistry, we chose a stable isotope which does not form with the rock…its presence is due solely to decay. Measuring the relative amounts of the two isotopes and knowing the half life of the radioactive isotope tells us the age of the rock....
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