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Radiometric Dating the age of the Earth in two ways: Assume: Rate of decay (half life) of long-lived elements has not varied since the Earth was formed. The Principle of Uniformitarianism The physical, chemical and biological laws that operate today have also operated in the geologic past.
Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed.
The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay.
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