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    Dating twentieth century

    If a certain kind of pollen is found in an archaeological site, scientists can check when the plant that produced that pollen lived to determine the relative age of the site.

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    The time it takes for one-half of the carbon-14 to decay (a period called a half-life) is 5,730 years.

    Dendrochronology: Also known as tree-ring dating, the science concerned with determining the age of trees by examining their growth rings.

    Half-life: Measurement of the time it takes for one-half of a radioactive substance to decay.

    This method is based on the assumption (which nearly always holds true) that deeper layers of rock were deposited earlier in Earth's history, and thus are older than more shallow layers.

    The successive layers of rock represent successive intervals of time.

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