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Absolute ages are much different from relative ages. Absolute ages are determined by radiometric methods, such as carbon-14 dating. Radioactive decay is the breakdown of unstable elements into stable elements. But carbon-12 has 6 neutrons and carbon-14 has 8 neutrons. Neutrons in cosmic rays strike nitrogen atoms in the atmosphere. Carbon in the atmosphere combines with oxygen to form carbon dioxide.To understand this process, recall that the atoms of all elements contain the particles protons, neutrons, and electrons. Plants take in carbon dioxide during photosynthesis. Like other unstable isotopes, carbon-14 breaks down, or decays.Understand how decay and half life work to enable radiometric dating.

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Learn about different types of radiometric dating, such as carbon dating.

Imagine that you start out with 100 grams of carbon-14. Figure below graphs the rate of decay of carbon-14.

The rate of decay of unstable isotopes can be used to estimate the absolute ages of fossils and rocks. The best-known method of radiometric dating is carbon-14 dating. A living thing takes in carbon-14 (along with stable carbon-12). Compare and contrast carbon-14 dating and potassium-40 dating.