1. Brooke Perry Rebecca Faust Jeff Bogutsky Donovan Sweet Leah Holleman
The Nitrogen Cycle
Brooke Perry
Rebecca Faust
Jeff Bogutsky
Donovan Sweet
Leah Holleman

2. Chemical Reactions
Oxidation: the loss of at least one electron when two or more substances interact; those substances may or may not include oxygen
Reduction: chemical reaction in which atoms have their oxidation number (oxidation state) changed

3. Inorganic Reservoirs Organic Reservoirs
Air
Organic Reservoirs
Soil

4. AND THE CYCLE BEGINS AGAIN!
Pathway of Movement
Nitrogen Fixation: process to break the nitrogen molecule apart so that its atoms can combine with other atoms, requiring the input of substantial amounts of energy
Decay: the breakdown of the molecules in excretions and dead organisms into ammonia
Nitrification: process of converting ammonia produced by decay into nitrates
Denitrification: reduces nitrates to nitrogen gas, thus replenishing the atmosphere.
AND THE CYCLE BEGINS AGAIN!

6. Impact of Humans on Cycle
Six major effects of NOx and NH3 emissions:
1) decreased atmospheric visibility due to ammonium aerosols (fine particulate matter [PM])
2) elevated ozone concentrations
3) ozone and PM affects human health (e.g., respiratory diseases, cancer)
4) increases in relative forcing and global climate change
5) decreased agricultural productivity due to ozone deposition
6) ecosystem acidification and eutrophication

7. Video