In the mixture of isotopes normally found on the earth at the present time, 238 U has an 92 abundance of 99.3% and U has an abundance of 0.7%. The measured lifetimes of 92 these isotopes are 6.52 x10' years and 1.02 x10' years, respectively. Assuming that they were equally abundant when the earth was formed, the estimated age of the earth, in years .
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