Nitrogen cycle/External Links
From Citizendium, the Citizens' Compendium
- Please sort and annotate in a user-friendly manner and consider archiving the URLs behind the links you provide. See also related web sources.
- Nitrogen Cycle: Nitrogen Transformations in Soil, Water, and Air From a page in the National Aeronautics and Space Administration (NASA) website.
- Nitrogen cycle From a page in the Britannica Encyclopedia.