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Human activities are substantially modifying the global carbon and nitrogen cycles. The global carbon cycle is being modified principally by the burning of fossil. 1 Mar 2012 Carbon Cycle: Carbon is the basic building block of the carbohydrates, fats, proteins, nucleic acids such as DNA and RNA, and other organic.
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When the major reservoir of a nutrient is in the atmosphere, it is known as a gaseous cycle, e. g. nitrogen cycle, which has its reservoir in the form of nitrogen gas. 20 Aug 2010 Nitrogen cycle is the conversion of atmospheric nitrogen into usable form and then its conversion back into atmospheric nitrogen. There are.
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Plants cannot absorb nitrogen from the atmosphere. Certain forms of bacteria are able to convert atmospheric nitrogen into usable forms such as nitrates and. 30 Jan 2015 The process of circulation of nitrogen between the atmosphere, soil, plants and animals is called the nitrogen cycle. Atmospheric nitrogen is. Nutrient cycles, or “biogeochemical cycles,” involve natural processes that Hydrologic cycle. Atmospheric cycles. Sedimentary cycles The nitrogen cycle.
