Carbon-14 dating method is based on the fact that (a) ratio of carbon-14 and carbon-12 is constant
Answers
Carbon-14. Carbon-14 is the result of cosmic rays mixed with atmospheric Nitrogen and is used to date fossils that are 50,000 years old or less.
Uranium-Thorium used to date fossils that are 75,000 years old or less.
Uranium-Lead used to date fossils that are older than 75,000 years up to 4.5 billion years.
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