1. nitrogen 1 a biogeochemical cycle that cycles material by fixation, assimilation, ammonification, nitrification, denitrification, and the food chain 2. phosphorus a geochemical cycle that cycles material by mantle convection, subduction, and seafloor spreading 3. tectonic 3 a biogeochemical cycle that cycles material by weathering, erosion, tectonic activity, and the food chain 4. carbon 6 a geochemical cycle that cycles material by weathering, erosion, deposition, cementation, and metamorphism 5. hydrologic a biogeochemical cycle that cycles material by photosynthesis, respiration, and the food chain 6. rock 5 a biogeochemical cycle that cycles material by evaporation, condensation, precipitation, and transpiration