3. Answer the following questions about limited and nonrenewable resources.
a. List three limited resources and three nonrenewable resources. (0.5 point)
b. Why is coal considered a nonrenewable resource? (0.5 point)
c. What effect does a growing human population have on the supply of coal? (0.5 point)
d. How is human use of coal connected to water and air quality? (0.5 point)