1. potassium

noun. (pəˈtæsiːəm) A light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite.
Synonyms
saltwater carnallite metal sylvine seawater kainite langbeinite brine sylvite metallic element atomic number 19 K
Antonyms
fresh water nonmetallic
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2. potassium-argon dating

noun. Geological dating that relies on the proportions of radioactive potassium in a rock sample and its decay product, argon.
Synonyms
geological dating dating
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