Nitrogen Cycle

Nitrogen Cycle
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  • Nitrous oxide from fossil fuels gets into the air because of factories. 
  • Falls as nitric acid in rainwater. It also contributes to the air being 78% nitrogen gas.
  • Runoff from nitrates in farming enters water. Bacteria in soil and water fix nitrogen from the air.
  • Plants obtain nitrate ions from water and soil bacteria. The animals eat the plants.
  • Decomposer bacteria break down animal and plant matter into nitrogen compounds.
  • Nitrogen compounds eventually break down into gas and return to the air again, continuing the cycle.
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