carbon cycle

Noun
  1. The organic circulation of carbon from the atmosphere into organisms and back again (synset 113464401)
    is a type of: biological process, organic process - a process occurring in living organisms
  2. A thermonuclear reaction in the interior of stars (synset 113464293)
    is a type of: thermonuclear reaction - a nuclear fusion reaction taking place at very high temperatures (as in the sun)

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