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What is a rock's radiometric clock?

User Vrm
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Step-by-step explanation:

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

User Victor Zuanazzi
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Answer: 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.

Step-by-step explanation:

User JScoobyCed
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