NASA
Nasa: Earth Observatory: The Carbon Cycle
Learn about the element carbon and its importance on the Earth's atmosphere and sustainability of life on the planet. Additionally, understand the role the carbon cycle plays in global climate change over time.
Other
Elmhurst College: Virtual Chembook: Carbon Cycle
A step-by-step discussion of the stages in the carbon cycle. Each step includes a diagram further explaining the processes involved, as well as pictures depicting combustion, respiration, photosynthesis, and decomposition.
BiologyWise
Biology Wise: An Easy Explanation of the Carbon Cycle for Kids
The importance of the carbon cycle, how it works, the sources of carbon, and the steps in the carbon cycle are explained here.