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If a rock had 80 radioactive atoms in it when it was formed and it now has 40 radioactive elements in it, how old is the rock?
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If a rock had 80 radioactive atoms in it when it was formed and it now has 40 radioactive elements in it, how old is the rock?

User Bowmore
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13 votes

its 120 that hoow old it is

User Ingemar
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