. "potassium-argon dating"@en-us . . "geological dating that relies on the proportions of radioactive potassium in a rock sample and its decay product, argon"@en-us . "potassium-argon dating"^^ . . . . . . "00992544-n"^^ . "100992544"^^ . "0"^^ . . . . "0"^^ . "100934727"@en-us .