avier is at NASA analyzing Moon rocks. In one of the rocks from the lunar maria, he discovered 79 % of the original uranium-238 remains, while remaining amount of uranium-238 had decayed into lead. The half life of uranium-238 is 4.5 × 109 years. Assume the only decay product is lead. How old is the lunar maria rock in billions of years (109 year

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Xavier is at NASA analyzing Moon rocks. In one of the rocks from the lunar maria, he discovered 79 % of the original uranium-238 remains, while remaining amount of uranium-238 had decayed into lead. The half life of uranium-238 is 4.5 × 109 years. Assume the only decay product is lead. How old is the lunar maria rock in billions of years (109 years)?

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