If you obtained a sample of Martian rock,determined the abundances of 238U and 207Pb in it,and found that for every 1 uranium atom there were 7 lead atoms,then what would the age of this rock be? Note that 238U decays to 207Pb with a half-life of 700 million years.Assume that there was no 207Pb in the rock when it originally formed.
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