Denitrification - Releases Nitrogen into atmosphere, Nitrogen fixation - Bacteria in plant roots do this, Photosynthesis - Lowers CO2 levels, increases O2 levels, Respiration - Lowers O2 levels, increases CO2 levels, Precipitation - Water returning to earth as either rain, sleet, or snow, Transpiration - Water vapor released by plants, Combustion - Burning which reduces O2, Percolation - Water seeping into the ground, Runoff - Water moving over the land surface, Decomposition - Adds carbon back to land, forms fossil fuels ,

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