Following the principle of "enjoining good and forbidding wrong", there are many limitations on behaviour and dress are strictly enforced both legally and socially, often more so than in other Muslim countries.
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How do archaeologists use radiocarbon dating
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The water leaking out the sides of the barrel represents the loss (mainly by radioactive decay) of the atmosphere's supply of carbon-14. We stick the garden hose in and turn it on full blast. The water coming out of the hose is analogous to the continuous production of carbon-14 atoms in the upper atmosphere. Carbon is naturally in all living organisms and is replenished in the tissues by eating other organisms or by breathing air that contains carbon. At any particular time all living organisms have approximately the same ratio of carbon 12 to carbon 14 in their tissues. In the case of radiocarbon dating, the half-life of carbon 14 is 5,730 years. This half life is a relatively small number, which means that carbon 14 dating is not particularly helpful for very recent deaths and deaths more than 50,000 years ago. Radiocarbon dating can be used on samples of bone, cloth, wood and plant fibers. The half-life of a radioactive isotope describes the amount of time that it takes half of the isotope in a sample to decay. Most striking was evidence that there was a smaller collapse prior to the Classic occurrence but the size of the population and building construction that took place before and after each collapse were almost identical. “What we found out is that those two cases of collapse — Classic and Preclassic — follow similar patterns,” Takeshi Inomata, lead study author and professor of anthropology and archaeology at the University of Arizona, said in a news release. |
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