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In: Chemistry

Two rocks are found that have different ratios R' of 238U to 206Pb: R' = 0.87...

Two rocks are found that have different ratios R' of 238U to 206Pb: R' = 0.87 and 2.1.

What are the ages of the two rocks? y (R' = 0.87)

y (R' = 2.1)Did they likely have the same origin?

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