The contained no lead at the time when it first crystallized

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A sample of rock is found to have a 235U/207Pb ratio of 1 to 15. From its minerology, we know that it contained no lead at the time when it first crystallized. How old is the rock? (Half life of 235U is 704 million years and 207Pb is the daughter product of 235U decay.)

Reference no: EM13506739

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