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  • Look at the beauty of nature
  • Or it is taken in by bacteria in the ground and on plant roots.
  • Nitrogen is in the air
  • It returns to the earth in the form of rain.
  • This process is called nitrogen fixation
  • After nitrogen is fixed in the ground by bacteria ,it is absorbed by plants.
  • This proceess is called assimilation
  • Nitrogen can be placed into water by runoff. The runoff most times comes from fertilizer.
  • This causes Eutrophication 
  • Sadly This process may be interrupted by human activity
  • Deforestation, farming, Clear cutting, Urbanization are just a few examples .
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