This web page addresses the question: How do we know the Age of the Earth? by citing radiometric dates from rocks and minerals of the Earth, Moon, and meteorites. The methods of radiometric dating are also discussed. Viewers will find a table of the common radiometric dating isotopes, their daughter elements, and their half-lives. This material was adapted from The Age of the Earth, by the Branch of Isotope Geology, United States Geological Survey, Menlo Park, California.
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