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

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

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User Uyetch
by
8.4k points

2 Answers

4 votes
35% i know that for sure
answered
User Ryaner
by
8.6k points
3 votes
The correct answer is 0.2167 billion years old. Hope thsi helps.
answered
User Migpics
by
8.3k points
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