Nitrogen Cycle

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  • Nitrogen Cycle
    • where does nitrogen come from?
      • 78% of nitrogen is from the air
    • why is nitrogen important?
      • essential for making amino acids in proteins
    • How is nitrogen gas converted to nitrate compounds?
      • _____________ - fixing _____________ that are naturally found in the soil
      • ______________ also converts nitrogen to nitrate compounds
    • Plants absorb nitrates in the soil to make ___________
      • animals eat plants so that they can make animal ______________
    • waste materials are broken down by _____________ to form _____________
      • nitrogen is returned to the air by ______________ bacteria


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