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The use of carbon-14 dating is often misunderstood.
Carbon-14 is mostly used to date once-living things (organic material).
Carbon-14 is constantly being added to the atmosphere.
These cosmic rays collide with atoms in the atmosphere and can cause them to come apart.
For example, all carbon atoms have 6 protons, all atoms of nitrogen have 7 protons, and all oxygen atoms have 8 protons.