How to date a rock.

• Localización: Scientific American, ISSN 0036-8733, Vol. 310, Nº. 3, 2014, págs. 62-62
• Idioma: inglés
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• Resumen

  • The article discusses methods of dating ancient rocks, focusing on measurement of isotope levels trapped inside during rock formation. The process is explained through the example of samarium 147 decaying into neodymium 143, including a graph showing the isotope ratios and a rock's age. The margin of error leads scientists to compare results from multiple ratios of uranium and lead.