Because of the properties of helium, all helium should escape a rock within 100,000 years. This means that no rock over 100,000 years should have any helium left. However, we have found helium in some pre-Cambrian rocks. 1 2 A more reasonable explanation is that the rocks are really only a few thousand years old, not millions.
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Sarfati, J. D., & Matthews, M. (1999). Refuting Evolution. Green Forest, AR: Master Books.
- Sarfati, 1999, p. 113: “Helium is pouring into the atmosphere from radioactive decay, but not much is escaping. But the total amount in the atmosphere is only 1/2000th of that expected if the atmosphere were really billions of years old. This helium originally escaped from rocks. This happens quite fast, yet so much helium is still in some rocks that it couldn’t have had time to escape — certainly not billions of years.” ↩
- http://www.answersingenesis.org/articles/am/v7/n4/helium-in-rocks ↩