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    Carbon dating of igneous rocks

    The rate of decay (given the symbol λ) is the fraction of the 'parent' atoms that decay in unit time.

    For geological purposes, this is taken as one year.

    There are two main methods determining a fossils age, relative dating and absolute dating.

    Further evidence comes from the complete agreement between radiometric dates and other dating methods such as counting tree rings or glacier ice core layers.

    Dinosaur bones, on the other hand, are millions of years old -- some fossils are billions of years old.

    To determine the ages of these specimens, scientists need an isotope with a very long half-life.

    The most widely known form of radiometric dating is carbon-14 dating.

    This is what archaeologists use to determine the age of human-made artifacts. The half-life of carbon-14 is only 5,730 years, so carbon-14 dating is only effective on samples that are less than 50,000 years old.

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