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12.1 The Fossil Record

Vocabulary Chapter 12 The History of Life Biology 2010 Holt McDougal
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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