Absolute Time in Geology. Which for youngest? The abundances of parent and daughter isotopes in a sample can be measured and used to determine their age. The Beyond. Anytime, anywhere.
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What is Relative Age? - Definition & Effect
So, instead of saying when something happened, it puts events in the order they happened. Thus, each radioactive isotope has been decaying at the same rate since it was formed, ticking along regularly like a clock. There are three general approaches that allow scientists to date geological materials and answer the question: