Carbon Cycle: Respiration, Photosynthesis, Decomposition, Carbon Dioxide CO2, Fossil Fuels, Ocean Uptake of CO2, Nitrogen Cycle: Fixing Bacteria, Denitrification, Nitrification, Ammonia NH3, DNA and Proteins, Nitrates NO2 and NO3, Hydrologic Cycle: Precipitation, Condensation, Transpiration, Runoff, Groundwater, Surface water,

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