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Gwar [14]
2 years ago
10

if an element has a half-life of 20 million years, and there is 6.25% of it remaining in a rock, how old is that rock?

English
1 answer:
Ahat [919]2 years ago
7 0
Working out: 6.25% = 4 half lives (20x4=80ma) 80ma is how old the rock is
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