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Nitrogen Cycle
Updated: 6/25/2020
Nitrogen Cycle
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Storyboard Text

  • Entering the Atmosphere
  • N
  • N
  • N
  • N
  • N
  • N
  • N
  • N
  • H
  • H
  • Meeting the Nitrogen-Fixing Bacteria
  • N
  • N
  • H
  • Before:
  • H
  • N
  • H
  • H
  • N
  • H
  • H
  • H
  • H
  • H
  • N
  • H
  • H
  • N
  • H
  • H
  • H
  • H
  • H
  • N
  • H
  • H
  • After:
  • H
  • N
  • H
  • H
  • H
  • H
  • N
  • H
  • H
  • H
  • O
  • O
  • O
  • H
  • Nitrification
  • H
  • H
  • N
  • H
  • O
  • Before:
  • O
  • H
  • O
  • H
  • H
  • N
  • H
  • O
  • O
  • N
  • O
  • After:
  • O
  • N
  • O
  • O
  • The nitrogen (N) travels down from the air to the soil through the form of precipitation.
  • Plant and Animal Use
  • O
  • N
  • O
  • O
  • O
  • O
  • The nitrogen molecules go into the soil under the plants, where they meet the nitrogen-fixing bacteria. These bacteria separate the molecules into atoms and combine them with hydrogen (H) to make ammonia, through a process called nitrogen fixation.
  • Denitrification
  • N
  • O
  • Before:
  • After:
  • Now, the ammonia went through nitrification and combined with oxygen (O), so they can go to the plants above without harming them.
  • Dead Organisms
  • The plants are using the compounds to make proteins (the colorful dots) needed to survive. The animal is eating these plants, which means that they take in the nitrogen compounds as well.
  • O
  • Back in the soil however, another bacteria takes hold of some ammonia. This bacteria turns the ammonia back into a molecule, before releasing it out as nitrogen gas.
  • O
  • N
  • O
  • N
  • Back above the soil, when the organisms that had the compounds died, they would go back to the soil as plain nitrogen, and the cycle would start all over again.
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