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    Carbon dating exam questions

    We cannot predict exactly which atom will decay at a certain time but we can estimate, using the half-life, how many will decay over a period of time.The half-life of a substance can be found by measuring the count-rate of the substance with a Geiger-Muller tube over a period of time.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.

    The stable form of carbon is carbon 12 and the radioactive isotope carbon 14 decays over time into nitrogen 14 and other particles.These rocks normally form relatively horizontal, parallel layers, with younger layers forming on top.If a fossil is found between two layers of rock whose ages are known, the fossil's age is thought to be between those two known ages.Stratigraphy is the science of understanding the strata, or layers, that form the sedimentary record.Strata are differentiated from each other by their different colors or compositions and are exposed in cliffs, quarries, and river banks.

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