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Potassium -40 is a radioactive material that decays into argon -40. The half-life of a sample of 40 K is one.3 billion years. rocks containing 40 K have been around since the formation of the earth and 40 AR gas has been accumulating in those rocks since earth formed. However when rocks are heated by volcanic action, all the 40 AR leaves the rock when the gas is escape create a scenario discuss based on your knowledge of half life value of potassium argon dating to geologist

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