Nitrogen cycle
"Cyclic movement of nitrogen in different chemical forms from the environment, to organisms, and then back to the environment." (UNFCCC, 2019)
Sources
UNFCCC. 'Glossary: Nitrogen cycle'. Accessed March 5, 2019. Link: http://unfccc.int/resource/cd_roms/na1/ghg_inventories/english/8_glossa…