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carbon cycle
astr.	C-N-Zyklus n; Kohlenstoff-Stickstoff-Zyklus m
earth.sc.	Bethe-Weizsaecker-Zyklus m; Kohlenstoffzyklus m
environ.	Kohlenstoffkreislauf m
carbon cycle The cycle of carbon in the biosphere, in which plants convert carbon dioxide to organic compounds that are consumed by plants and animals, and the carbon is returned to the biosphere in inorganic form by processes of respiration and decay
environ.	Kohlenstoffkreislauf m

carbon cycle: 5 phrases in 3 subjects

Astronomy	3
Medical	1
Physics	1