The Carbon Cycle represents how carbon travels through the biosphere, but there are other important elements that are also cycled.  Nitrogen is a critical component of amino acids, which are a building block for protein.  All of the protein in your body contains nitrogen.  Phosphorous is critical for the formation of healthy bones and for DNA, which codes all of the genetic material for living things.  Both Nitrogen and Phosphorous are critical components for life on earth.

You will be watching some interactive movies to learn about the nitrogen and phosphorous cycles.

Keywords to know:

  • nitrogen fixation, nitrification, denitrification, eutrophication



  • Nitrogen Cycle Worksheet
  • Phosphorous Cycle Worksheet
  • Workbook p27-28


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