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23 April, 16:54

Basalt with half live of 10 million years and 1/8 is remaining, how old is rock?

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  1. 23 April, 20:47
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    You multiply 1/8 by 10,000,000 = 1,250,000

    we know 3 half life makes 1/8

    1/2*1/2*1/2 = 1/8. 3 half lifes.

    3 * 1,250,000 = 3,750,000
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