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Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that Blog A must for anyone with an interest in the changing face of language.Scientists use a technique called radiometric dating to estimate the ages of rocks, fossils, and the earth.Atoms are made up of much smaller particles called protons, neutrons, and electrons.Protons and neutrons make up the center (nucleus) of the atom, and electrons form shells around the nucleus.

Radiocarbon, or carbon 14, is an isotope of the element carbon that is unstable and weakly radioactive. Carbon 14 is continually being formed in the upper atmosphere by the effect of cosmic ray neutrons on nitrogen 14 atoms.

Before we get into the details of how radiometric dating methods are used, we need to review some preliminary concepts from chemistry.

Recall that atoms are the basic building blocks of matter.

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The thesaurus of synonyms and related words is fully integrated into the dictionary.