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Noun
1. nitrogen cycle
Wikipedia definition
2. Nitrogen cycleThe nitrogen cycle is the process by which nitrogen is converted between its various chemical forms. This transformation can be carried out to both biological and non-biological processes. Important processes in the nitrogen cycle include fixation, mineralization, nitrification, and denitrification. The majority of Earth's atmosphere (approximately 78%) is nitrogen, making it the largest pool of nitrogen.
Read “Nitrogen cycle” on English Wikipedia
Read “窒素循環” on Japanese Wikipedia
Read “Nitrogen cycle” on DBpedia

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