Nitrogen cycle: Difference between revisions
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On Earth, [[atom]]s of the [[chemical element]], [[nitrogen]] (atomic symbol, N; number of [[proton]]s, 7; [[Atomic mass|standard atomic weight]], 14.0067 [[Atomic mass|u]]) — an essential element for Earth's [[Life|living systems]] — undergo cyclical movement through the [[atmosphere]], the crust ([[lithosphere]]), [[water]] compartments ([[hydrosphere]]), living systems, and non-living organic matter, in a process called the <b>nitrogen cycle</b>, or more specifically, the biogeochemical nitrogen cycle.<ref name=nasa1>[http://soil.gsfc.nasa.gov/NFTG/nitrocyc.htm The Nitrogen Cycle: Nitrogen Transformations in Soil, Water, and Air.]</ref> | On Earth, [[atom]]s of the [[chemical element]], [[nitrogen]] (atomic symbol, N; number of [[proton]]s, 7; [[Atomic mass|standard atomic weight]], 14.0067 [[Atomic mass|u]]) — an essential element for Earth's [[Life|living systems]] — undergo cyclical movement through the [[atmosphere]], the crust ([[lithosphere]]), [[water]] compartments ([[hydrosphere]]), living systems, and non-living organic matter, in a process called the <b>nitrogen cycle</b>, or more specifically, the biogeochemical nitrogen cycle.<ref name=nasa1>[http://soil.gsfc.nasa.gov/NFTG/nitrocyc.htm The Nitrogen Cycle: Nitrogen Transformations in Soil, Water, and Air.]</ref> | ||
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Revision as of 23:37, 20 February 2010
On Earth, atoms of the chemical element, nitrogen (atomic symbol, N; number of protons, 7; standard atomic weight, 14.0067 u) — an essential element for Earth's living systems — undergo cyclical movement through the atmosphere, the crust (lithosphere), water compartments (hydrosphere), living systems, and non-living organic matter, in a process called the nitrogen cycle, or more specifically, the biogeochemical nitrogen cycle.[1]