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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/

Nitrogen Cycle
A diagram and overview.
www.elmhurst.edu/

Visual Elements: Nitrogen
Animation, uses, physical information, and key isotopes.
www.chemsoc.org/

The Nitrogen Cycle
An explanation of the different forms of nitrogen on earth, nitrogen fixation, decay, and nitrification.
users.rcn.com/

Human Alteration of the Global Nitrogen Cycle
An article showing human impacts at all levels of this cycle.
www.esa.org/

The Nitrogen Cycle
Diagram and explanation of the cycle.
www.physicalgeography.net/

The Nitrogen Cycle
Learn about the nitrogen cycle, and how humans have made an impact on it. Includes a quiz.
library.thinkquest.org/

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/

Animation of Nitrogen Cycle
Presents an active diagram of this process, together with a description of each stage and component.
www.sp.uconn.edu/

Nitrogen Cycle
Diagram, facts, nitrogen fixation methods, and what fixes nitrogen.
homepages.nyu.edu/