rossvikiki rossvikiki

02-02-2017
Biology

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how old is a rock that has 70% of it's original K-40

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Аноним Аноним

02-02-2017

The correct answer is 0.2167 billion years old. Hope thsi helps.

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liljunebug17 liljunebug17

06-02-2017

35% i know that for sure

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