3 years ago

A rock from the moon contains 12.5 percent of the potassium-40 it began with. how old is the rock

1 answer:

4 0

1.25 billion years ago,2.5 billion years ago, 3.75 years ago,and 5 billion years ago.

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algol13

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Misha Larkins [42]

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Andre45 [30]

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