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

User Uyetch
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2 Answers

4 votes
35% i know that for sure
User Ryaner
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5.9k points
3 votes
The correct answer is 0.2167 billion years old. Hope thsi helps.
User Migpics
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6.5k points
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