Carbon Dioxide can be added to the atmosphere by ___________________________

What % of soil organic matter is made of soil organic carbon

What % Nitrogen gas is in the atmosphere?

Bacteria called _____________________ fix atmospheric Nitrogen

Bacteria that fix Nitrogen gas are found in swellings called ______________ which are found in the roots of some plants

_______________________ is an example of a plant that has bacteria in its roots that can fix Nitrogen gas

Plants that can fix Nitrogen gas are called ______________

When plants and animals die plant and animal proteins are changed into ___________________

When Nitrogen gas is fixed it is changed into ________________

When Ammonia is broken down it is changed into ___________

_____________________________ is when Ammonia is changed into ntrites and nitrates

_____________________________ is when nitrites are changed into nitrates

_____________________________ is when nitrates are changed into nitrogen gas

_____________________________ is when nitrogen gas is changed into nitrates