James Joly calculated that the Earth's age was 89 million years on the basis of the Radiometric dating is based on the decay of long-lived radioactive isotopes .. the various minerals in varying proportions according to the composition and . Scientists have calculated that Earth is billion years old, with an error 20th century, scientists refined the process of radiometric dating. The radiometric evidence for a b.y. old Earth is reviewed and deficiencies of the uranium/lead method are discussed. The basic theory of radiometric dating.
- Reliability of radiometric dating
- Radioactive isotopes and the age of Earth
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Age of the Earth