Which values do scientists compare when using potassium-argon dating?

Potassium-argon dating estimates a rock’s age by comparing the amount of radioactive potassium-40 (the parent material) with the amount of argon-40 produced as it decays (the daughter material). This comparison gives scientists information about how much time has passed since the rock formed. So the correct choice is the amount of parent and daughter material trapped in the rock.

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