The Nitrogen Cycle - Nitrogen Transformations in Soil, Water, and Air
http://soil.gsfc.nasa.gov/NFTG/nitrocyc.htm

Nitrogen Backgrounder - Nitrogen in the Earth System
http://www.ucar.edu/news/backgrounders/nitrogen.shtml

Nitrogen Cycle - Oceans Connecting a Nation
http://www.k12science.org/curriculum/oceansproj_new/students/cycle.html

The Nitrogen Cycle - Student Worksheet
http://www.scienceteacherprogram.org/earthscience/AEdwards08-2.html

Nitrogen Cycle PowerPoint

Credits: Nitrogen Cycle Image:
download http://www.scienceteacherprogram.org/earthscience/AEdwards08-2.html. October 27, 2008.