By means of potassium-argon dating, the age of the African man, Zinjanthropus, has been determined to be 1,750,000 years in the past (Science News Letter).
Useful english dictionary. 2012.
potassium-argon dating — /peuh tas ee euhm ahr gon/, Geol. a method for estimating the age of a mineral or rock, based on measurement of the rate of decay of radioactive potassium into argon. [1965 70] * * * Method for determining the age of igneous rocks based on the… … Universalium
potassium-argon dating — noun geological dating that relies on the proportions of radioactive potassium in a rock sample and its decay product, argon • Hypernyms: ↑dating, ↑geological dating * * * /peuh tas ee euhm ahr gon/, Geol. a method for estimating the age of a… … Useful english dictionary
potassium-argon — po·tas·si·um ar·gon (pə tăs ē əm ärʹgŏn ) adj. Of, relating to, or being a geologic dating method relying on the percentage of potassium in a specimen that has radioactively decayed to argon. * * * … Universalium
Laryngeal theory — The laryngeal theory is a generally accepted theory of historical linguistics which proposes the existence of a set of three (or more) consonant sounds that appear in most current reconstructions of the Proto Indo European language (PIE). These… … Wikipedia
