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The age of rocks on earth or the samples of rocks and dust brought back from the moon can be found by determining the proportion of radioactive in the rock of dust.

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Potassium and stable calcium

Uranium and stable lead

Carbon and stable carbon

Radium and stable lead

answer is B.

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Detailed Solution

It is believed that the uranium isotope undergoes disintegration and forms lead. The left over lead will give and idea about the age of the rock.

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