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Archaeology and other human sciences use radiocarbon dating to prove or disprove theories.
It is rapidly oxidized in air to form carbon dioxide and enters the global carbon cycle.
This is problematic because lead (daughter) is derived from uranium (parent).
If it wasn’t present initially, then uranium in its purest form must have just suddenly appeared.
Second, it is assumed that within any given sample, no parent or daughter elements ever entered or left the sample.
Third, the rate of radioactive decay has remained constant.
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Other radiometric dating methods such as potassium-argon or rubidium-strontium are used for such purposes by those who believe that the earth is billions of years old.