Why are biogeochemical cycles important? Earth is a closed system. That means the amount of rocks, metals, carbon, nitrogen, oxygen, and water on Earth ... So, it is essential that biogeochemical cycles ... these materials as they move through Earth's subsystems.

The earth is considered to be a closed system, where the concentration of rocks, metals, C, N, O and H₂O on earth remains constant.

So, it is essential that the biogeochemical cycle renews these materials while moving through the earth subsystems.

Explanation:

The biogeochemical cycle is usually defined as the circulation of chemical components such as Carbon, Nitrogen, Phosphorous, Oxygen, rocks, and metals within the different spheres and interaction of biotic and non-biotic factors.

These components are continuously in motion from one sphere to another. For example, the organism takes up the elements through food and some of these components such as carbon is released into the atmosphere in the form of CO₂. After the death of the organisms, the decomposers feed on these elements, where some of it is consumed by them and the remaining is eliminated into the atmosphere.

So, this is how the elements are renewed, and they are conserved. The total concentration of these elements remains constant considering the earth to be a closed system.

Thus, the correct answers are given above.