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Vocabulary Chapter 12 The History of Life Biology 2010 Holt McDougal

relative dating

estimate of the age of a fossil based on the location of fossils in strata

radiometric dating

technique that measures the natural decay rate of isotopes to calculate the age of material

isotope

form of an element that has the same number of protons but a different number of neutrons as another element

half-life

amount of time it takes for half of the isotope in a sample to decay into its product isotope

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