To combine the two, suppose that you know that a specific fossil is 100 million years old and that another is 95 million years old.
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All ordinary matter is made up of combinations of chemical elements, each with its own atomic number, indicating the number of protons in the atomic nucleus.
Additionally, elements may exist in different isotopes, with each isotope of an element differing in the number of neutrons in the nucleus.Free 5-day trial Radiometric dating is used to estimate the age of rocks and other objects based on the fixed decay rate of radioactive isotopes.Learn about half-life and how it is used in different dating methods, such as uranium-lead dating and radiocarbon dating, in this video lesson. As we age, our hair turns gray, our skin wrinkles and our gait slows.If you look at a series of fossils, say shells or mammal bones, you may be able to see the development of structures that give an indication of which fossils are older.In all these instances, you may be able to tell the relative ages of the items being examined, but you will not necessarily know the actual ages (101 years, 10000 years, 100 million years) or the amount of time between an older and a younger specimen.and is now the principal source of information about the absolute age of rocks and other geological features, including the age of fossilized life forms or the age of the Earth itself, and can also be used to date a wide range of natural and man-made materials.