I think its, They continuously recycle Earth's materials.
They contribute to a balance or equilibrium of Earth's materials.
Answer: Option A and B
Explanation:
The interaction between rock cycle, hydrologic and tectonic cycle continuously recycle the materials on Earth. The interaction between the tectonic and the hydrologic systems helps in recycling of the materials on earth.
These cycles helps in maintaining the equilibrium of the or balance of the material of the earth. The levels of material on earth is maintained by the continuous flow of material.