Carbon Dioxide can be removed from the atmosphere by ___________________________

• Respiration of animals

• Respiration of plants

• Photosynthesis

• Burning of fossil fuels

Carbon Dioxide can be added to the atmosphere by ___________________________

• Respiration of animals

• Respiration of plants

• Photosynthesis

• Burning of fossil fuels

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

• 10%

• 25%

• 58%

• 100%

What % Nitrogen gas is in the atmosphere?

• 21%

• 45%

• 60%

• 78%

Bacteria called _____________________ fix atmospheric Nitrogen

• E. Coli

• Lactobacillus

• Rhizobium

• Streptococcus

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

• Legumes

• Ganglion

• Nodules

• Clover

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

• Grass

• Dandelion

• Dock

• Clover

Plants that can fix Nitrogen gas are called ______________

• Legumes

• Grasses

• Weeds

• Shrubs

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

• Ammonium Compounds

• Nitrites

• Nitrates

• Amino Acids

When Nitrogen gas is fixed it is changed into ________________

• Ammonium Compounds

• Nitrites

• Nitrates

• Amino Acids