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Radioactive dating enables geologists to record the history of the earth and its events, such as the dinosaur era, within what they call the geologic time scale.

Radioactive dating uses the ratios of isotopes and their specific decay products to determine the ages of rocks, fossils and other substances.

Scientists can use the half-life of Carbon-14 to determine the approximate age of organic objects less than 40,000 years old.

By determining how much of the carbon-14 has transmutated, scientist can calculate and estimate the age of a substance. Isotopes with longer half-lives such as Uranium-238 can be used to date even older objects.

Each element is made up of atoms, and within each atom is a central particle called a nucleus.

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