Science

• Nitrogen release from air

  1. Nitrogen gas released

  2. Nitrogen combined with other compounds
• Nitrogen cycle


  Process of nitrogen release and combination with other compounds
• Crops that replace used up nitrogen

  • Clover
  • Alfalfa
• Nitrogen compounds are converted by the bodies of living things into useful forms called proteins
• Nitrogen is extremely important for good crop production
• Farmers will often plant crops such as clover and alfalfa to replace the used up nitrogen
• Composition of air


  • Carbon dioxide
  • Oxygen
  • Hydrogen
  • Nitrogen
• The gas and oil industry is often concerned with having to treat the problem of "sour gas"
• "Sour gas"


  Hydrogen sulfide
• Industries now convert the "sour gas" into secondary products such as sulfur
• Cardiac muscle is found only in the heart and allows involuntary contraction.