"Carbo" the Carbon Atom
http://www.letus.northwestern.edu/projects/gw/cycles/carbo/index.html

Northwestern University Global Warming Project

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Students can learn about the carbon cycle by following a carbon atom through its "travels". They can interact with the story by choosing which of several paths the atom may take through various sources and sinks for carbon. Because of the cyclical nature of the process, the students will find themselves returning to the portion of the cycle in which the atom exists as atmospheric carbon dioxide.

This resource originally cataloged at:

Subject: Biology
Grade Level: High School (9-12), Intermediate (3-5), Middle (6-8)