| A | B |
|---|
| process that takes in CO2 from atmosphere | photosynthesis |
| organisms that take in atmospheric N into the soil | bacteria |
| changing ammonium into nitrate ions | nitrification |
| burning of fossil fuels | combustion |
| evaporation of water from plants | transpiration |
| water going from surface of land to an aquifer | infiltration |
| soil nitrogen going to atmospheric nitrogen | denitrification |
| process that moves phosphorous from rocks to river | erosion |
| water changing into clouds | condensation |
| carbon dioxide released by decomposers | respiration |
