Carbon, Nitrogen Cycle Quiz 1. List the 6 processes involved in the carbon cycle. Begin with how CO2 is removed from the atmosphere , tell how fossil fuels are formed, how they are removed from the earth and how they are used by humans. 2. List 6 Nitrogen reservoirs. 3. Plants and animals use nitrogen to make what? 4. What tiny organisms do most of the work throughout the nitrogen cycle? 5. List the three types of mining for fossil fuels. 6. List the three states of matter fossil fuels can be found in and give an example for each.