why is there still radioactive material on earth? Why hasn’t it all decayed?
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There is radioactive stuff that’s been on earth for a long time because it takes a long time to decay, or that is a decay product of something that takes a long time to decay, and there is new radioactive stuff being created by space radiation bombarding earth and turning stable stuff radioactive, like cosmic rays making thermal neutrons that interact with Nitrogen 14 and turn it into Carbon 14.
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