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Symbol: C; atomic no.: 6; atomic wt.: 12.011; valency: 2, 3, or 4; relative density: 1.8--2.1 (amorphous), 1.9--2.3 (graphite), 3.15--3.53 (diamond); sublimes at 3367±25°C; boiling pt.: 4827°circulation of carbon between living organisms and their surroundings.

Carbon dioxide from the atmosphere is synthesized by plants into plant tissue, which is ingested and metabolized by animals and reduced to carbon dioxide again during respiration and decaya colourless odourless incombustible gas present in the atmosphere and formed during respiration, the decomposition and combustion of organic compounds, and in the reaction of acids with carbonates: used in carbonated drinks, fire extinguishers, and as dry ice for refrigeration.

Pre-registration for the 2017 New York State FFA Tractor Driving Safety Contest is now open through July 3 by contacting coordinator Jon Clayson at Pioneer Central School at [email protected]

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The carbon 14 present in an organism at the time of its death decays at a steady rate, and so the age of the remains can be calculated from the amount of carbon 14 that is left. The cells of all living things contain carbon atoms that they take in from their environment.

have revealed that the remains recovered - three leg bones and an arm bone from the left side of the body and fragments of skull and jaw with four teeth - belonged to a man believed to have been aged 30 to 40 whose maximum height would have been 5ft 5in.

Most carbon atoms have six protons and six neutrons in their nuclei and are called carbon 12. But a tiny percentage of carbon is made of carbon 14, or radiocarbon, which has six protons and eight neutrons and is not stable: half of any sample of it decays into other atoms after 5,700 years.

Carbon 14 is continually being created in the Earth's atmosphere by the interaction of nitrogen and gamma rays from outer space.

suggests that the coral-like Gerardia specimen -- retrieved from the Atlantic at a depth of 600 meters -- may have lived for as long as 1,700 years, researchers reported last week at the International Radiocarbon Conference in Tucson, Ariz.

carbon datingn : a chemical analysis used to determine the age of organic materials based on their content of the radioisotope carbon-14; believed to be reliable up to 40,000 years [syn: radiocarbon dating, carbon-14 dating]Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon , a radioactive isotope of carbon.

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