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the carbon cycle - definition and synonyms

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noun the carbon cycle pronunciation in American English
  1. 1
    biology the movement of carbon between living things and their environment. Carbon dioxide is taken from the atmosphere and used by plants. It then moves from plants eaten as food to animals, and is returned to the atmosphere by the respiration of plants and animals and by the burning of plant material.
  2. 2
    astronomy a reaction that is believed to produce energy in some stars, in which carbon is used as a catalyst to combine four hydrogen nuclei into one helium nucleus

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