| NOUN | act | potassium-argon dating | geological dating that relies on the proportions of radioactive potassium in a rock sample and its decay product, argon |
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| Meaning | geological dating that relies on the proportions of radioactive potassium in a rock sample and its decay product, argon. | |
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| Broader | dating, geological dating | Use of chemical analysis to estimate / estimate the age of geological specimens |
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