It is the only biogeochemical that does not move to the atmosphere because it is solid in form.
a. Carbon b. Hydrogen c. Phosphorus

Which of the substances below, when present in low concentration in soil reduces plant growth?
a. Oxygen b. Nitrogen c. Phosphorus

Which of the organisms below has less participation in the changing process of the biogeochemical?
a. Human b. Plants c. Bacteria

The most abundant substance in the atmosphere?
a. Carbon b. Oxygen c. Nitrogen

What chemical compound that cycles in the environment changing only its physical state?
a. Air b. Water c. Carbon Dioxide​​