In a rock from the lunar highlands

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In a rock from the lunar highlands, you determine that 50% of the original uranium-238 remains, while the other 50% has decayed into lead. How old is the rock?

In a rock from the lunar maria, you find that 56% of the original uranium-238 remains, while the other 44% has decayed into lead. Is this rock older or younger than the highlands rock?

By how much?

Reference no: EM13301967

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