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Thus they probably formed at a depth of 100–200 km.
) is only 5,730 years—that is, every 5,730 years, half of it decays away.
After two half lives, a quarter is left; after three half lives, only an eighth; after 10 half lives, less than a thousandth is left.
, that is formed during respiration, combustion, and organic decomposition, is an essential component in photosynthesis, and is used in food refrigeration, carbonated beverages, inert atmospheres, fire extinguishers, and aerosols. (Elements & Compounds) a 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. Also called: carbonic-acid gas , that is present in the atmosphere and is formed when any fuel containing carbon is burned.
It is breathed out of an animal's lungs during respiration, produced by the decay of organic matter, and used by plants in photosynthesis.
Carbon is unique in its chemical properties because it forms a number of components superior than the total addition of all the other elements in combination with each other.