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Nitrogen cycle | Definition & Steps | Britannica nitrogen cycle, circulation of nitrogen in various forms through nature. Nitrogen, a component of proteins and nucleic acids, is essential to life on Earth. Although 78 percent by volume of the atmosphere is nitrogen gas, this abundant reservoir exists in a form unusable by most organisms. The Nitrogen Cycle | Earth Science | Visionlearning The nitrogen cycle is the set of biogeochemical processes by which nitrogen undergoes chemical reactions, changes form, and moves through difference reservoirs on Earth, including living organisms. Nitrogen is required for all organisms to live and grow because it is the essential component of DNA, RNA, and protein. However, most organisms ... PDF Critical Thinking Activity: Living in The Nitrogen Cycle nitrogen that is already in compound form. For nitrogen to be used by different life forms on Earth, it must be "fixed" or changed into different states. Nitrogen in the atmos...