Radiocarbon dating can be used to date materials that
The atoms of some chemical elements have different forms, called isotopes.These break down over time in a process scientists call radioactive decay.
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Geologists choose a dating method that suits the materials available in their rocks. Measuring isotopes is particularly useful for dating igneous and some metamorphic rock, but not sedimentary rock.
For example, the decay of potassium-40 to argon-40 is used to date rocks older than 20,000 years, and the decay of uranium-238 to lead-206 is used for rocks older than 1 million years.
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