What are the main pools of nutrients in gaseous biogeochemical cycles?

In the context of biogeochemical cycles, the main pools of nutrients in gaseous cycles are primarily found in the atmosphere and oceans. Gaseous biogeochemical cycles involve the movement of nutrients such as carbon, nitrogen, and sulfur in gaseous forms.

The atmosphere serves as a key reservoir for these gases, with carbon dioxide, nitrogen gas, and sulfur dioxide playing vital roles in various biological and geological processes. For instance, carbon dioxide is crucial for photosynthesis, while nitrogen gas is essential for nitrogen fixation, allowing it to enter the food web. The oceans also act as a significant pool, where these gases can dissolve, interact with marine organisms, and contribute to processes like respiration and decomposition.

Other choices do not accurately represent major pools in gaseous biogeochemical cycles. Soil and rocks are important for nutrient cycling but primarily represent solid-state reservoirs, traditionally associated with mineral form rather than gaseous elements. Lake sediments and groundwater also relate to nutrient storage but typically involve solid-state or dissolved nutrients rather than atmospheric gases. Lichens and bacteria, while critical in nutrient cycling and ecological processes, are not large pools themselves but rather functioning organisms that interact with these larger nutrient reservoirs.

Thus, the atmosphere and oceans are recognized as the primary pools of