Carbon and uranium radioactive dating
The amount of carbon-14 in the atmosphere has not changed in thousands of years.Even though it decays into nitrogen, new carbon-14 is always being formed when cosmic rays hit atoms high in the atmosphere.However, rocks and other objects in nature do not give off such obvious clues about how long they have been around.
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It works because we know the fixed radioactive decay rates of uranium-238, which decays to lead-206, and for uranium-235, which decays to lead-207.Plants absorb carbon dioxide from the atmosphere and animals eat plants.
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