Explore the biogeochemical cycles that move water, carbon, nitrogen, and phosphorus throughout Earth's spheres. a. Why do humans have a strong impact on the fast carbon cycle? (2 points)
b. Describe a major difference between the spheres involved in the nitrogen cycle and those involved in the phosphorus cycle. (2 points)
c. Describe how the biogeochemical cycles follow the first law of thermodynamics. (2 points)
d. Are limestone deposits part of the fast or slow carbon cycle? Why? (2 points)