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The radioactive parent elements used to date rocks and minerals are:. This radioactivity can be used for dating, since a radioactive 'parent' element decays into a stable 'daughter' element at a constant rate.

Radiometric dating has been volcanic rock radiometric dating to determine the ages of the Earth, Moon, meteorites, ages of fossils, including early man, timing of glaciations, ages of mineral deposits, recurrence rates of earthquakes and volcanic eruptions, the history of reversals of Earth's magnetic field, and many of other geological events and processes.

Although we now recognize lots of problems with that calculation, the age of 25 my was accepted by most physicists, but considered too short by most geologists.

Carbon is a method used for young less than 50, year old sedimentary rocks.

Luminescence dating methods are not radiometric dating methods in that they do not rely on abundances of isotopes to calculate age.

A particular isotope of a particular element is called a nuclide.

U would have been stable in the crystallographic site, but the site is now occupied by by Pb.

The residence time of 36 Cl in the atmosphere is about 1 week.

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Thus, as an event marker of s water in soil and ground water, 36 Cl is also useful for dating waters less than 50 years before the present.

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