Among the techniques for determining, the age of organic remains is radiocarbon dating. Organic matter includes once-living things like wood artifacts, campfire ashes, bone, and cotton cloth. A very small percentage of the carbon atoms absorbed by every living things is radioactive. When any living things die, it stops absorbing carbon. Then because radioactive carbon decays at a known rate, archaeologist can measure how much the radioactive carbon remains has decayed and figure out when the animal or plant die.
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Wednesday, July 9, 2008
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