What is a rock's radiometric clock?

This method is known as radiometric dating. When that mineral forms and the rock cools enough that argon can no longer escape, the "radiometric clock" starts. Over time, the radioactive isotope of potassium decays slowly into stable argon, which accumulates in the mineral.

Explanation:

Explanation:

When that mineral forms and the rock cools enough that argon can no longer escape, the "radiometric clock" starts.

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