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This content is available through Read Online (Free) program, which relies on page scans.Since scans are not currently available to screen readers, please contact JSTOR User Support for access. If the concentration of argon-40 is almost zero, then the rock was formed recently.

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. 1979, 1986 © Harper Collins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cite This Source potassium-argon dating A method of radiometric dating, involving analysis of the ratio of potassium 40 (a radioactive isotope of potassium) to argon (the product of radioactive decay of potassium 40) in a given sample.

The useful fact about these two substances is that at normal temperatures, potassium is a solid, but argon is a gas.

Therefore, during volcanic eruptions, any argon that is present escapes from the rock.

Geologists have used this method to date rocks as much as 4 billion years old.

It is based on the fact that some of the radioactive isotope of Potassium, Potassium-40 (K-40) ,decays to the gas Argon as Argon-40 (Ar-40).




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