Cycles
Nitrogen Cycle
Dentrification
Nitrifying Bacteria
Nitrogen Fixation
Nitrogen in the Atmosphere
Carbon Cycle
Evaporation/Transpiration
Oxygen Cycle
Plants make Oxygen with photosynthesis, and carbon dioxide.
Animals breathe out carbon dioxide
Oxygen
Animals breathe in Oxygen
Water Cycle
Coal, Oil, or Gas
Rock Formation
Carbon Dioxide exchange
Burning
Respiration
Decay
Burning Fossil Fuels
Atmosphere
Run off
Precipitation
Condensation
Cycles