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So by measuring carbon 14 levels in an organism that died long ago, researchers can figure out when it died.The procedure of radiocarbon dating can be used for remains that are up to 50,000 years old.

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Other forms with little crystallinity are vegetal carbon and black fume.Its density fluctuates from 2.25 g/cm³ (1.30 ounces/in³) for graphite and 3.51 g/cm³ (2.03 ounces/in³) for diamond.The melting point of graphite is 3500ºC (6332ºF) and the extrapolated boiling point is 4830ºC (8726ºF).Chemically pure carbon can be prepared by termic decomposition of sugar (sucrose) in absence of air.The physical and chemical properties of carbon depend on the crystalline structure of the element.How Carbon Dating works Carbon dating is one method scientists use to measure the ages of objects which were alive at some time in the past.