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He was employed at Caltech's Division of Geological & Planetary Sciences at the time of writing the first edition.He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory. Wiens has a Ph D in Physics, with a minor in Geology.

Uranium-lead dating uses four different isotopes to find the age of the rock.

Because uranium is radioactive, it is constantly emitting particles and changing into other elements.

Uranium has a well-established radioactive decay series.

Radiometric dating--the process of determining the age of rocks from the decay of their radioactive elements--has been in widespread use for over half a century.

There are over forty such techniques, each using a different radioactive element or a different way of measuring them.

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