Radiometric dating is used to date most igneous rocks. Scientists measure the rate of decay of their radioactive isotopes according to their corresponding half-life rates and then determine an age of the rock.
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Absolute or radiometric dating would be more useful and accurate for dating volcanic rocks. By using radioactive isotopes, scientists can find the rate of decay of the in the parent isotope compared to the daughter isotope. This ratio is called the half-life that can be used to calculate the absolute, numerical age of a sample.
Igneous rocks are easy to date because they solidify quickly in a volcanic environment once exposed to the surface, or pressure underneath the surface.
Pretty smart rocks…however, the genius involved in spelling volcanic or geological remains to be measured.
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