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An explanation of the different forms of nitrogen on earth, nitrogen fixation, decay, and nitrification.
users.rcn.com
The Microbial World: The Nitrogen Cycle and Nitrogen Fixation
How nitrogen gets "fixed" by bacteria to become available for plants on earth.
helios.bto.ed.ac.uk
A diagram and overview.
www.elmhurst.edu
An interactive diagram: you click on an aspect of the cycle or a state of nitrogen and the diagram will simplify to show you which part of the cycle it applies to.
www.neuse.ncsu.edu
Streams Reduce Nitrogen Pollution, Scientists Find
Article describing the finding of scientists that small streams are extremely efficient at removing some of the excess nitrogen that is flowing into waterways, endangering fish and other forms of aquatic life.
news.nationalgeographic.com
Diagram, facts, nitrogen fixation methods, and what fixes nitrogen.
homepages.nyu.edu
Presents an active diagram of this process, together with a description of each stage and component.
www.sp.uconn.edu
Nutrient Overload: Unbalancing the Global Nitrogen Cycle
Shows how nutrient pollution through man can lead to algae blooms that unbalance the cycle.
pubs.wri.org
Learn about the nitrogen cycle, and how humans have made an impact on it. Includes a quiz.
library.thinkquest.org
Diagram and explanation of the cycle.
www.physicalgeography.net
Human Alteration of the Global Nitrogen Cycle
An article showing human impacts at all levels of this cycle.
www.esa.org