In both the carbon and nitrogen cycles, atoms move from one substance to another. However, the details and the components of the two cycles are different.

Select the buttons to show in which cycle each component plays a role.

Carbon Cycle:

- Atmosphere
- Living organisms
- Fossil fuels
- Photosynthesis
- Respiration
- Decomposition

Nitrogen Cycle:
- Atmosphere
- Nitrogen fixation
- Nitrification
- Denitrification
- Assimilation
- Decomposition