The Nitrogen Cycle Crossword Puzzle

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Across
  1. 2. the chemical processes by which atmospheric nitrogen is assimilated into organic compounds, especially by certain microorganisms as part of the nitrogen cycle.
  2. 5. organic compounds that combine to form proteins.
  3. 6. the ionised form of ammonia
  4. 7. Bacteria or fungi convert the organic nitrogen within the remains back into ammonium
  5. 9. the upper layer of earth in which plants grow, a black or dark brown material typically consisting of a mixture of organic remains, clay, and rock particles.
  6. 10. a naturally occurring electrostatic discharge during which two electrically charged regions in the atmosphere or ground temporarily equalize themselves, causing the instantaneous release of as much as one gigajoule of energy.
Down
  1. 1. natural chemicals that are found in the soil, air and water.
  2. 2. is a colorless, odorless and tasteless gas that makes up 78.09% (by volume) of the air we breathe.
  3. 3. microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen that is usable by plants.
  4. 4. a chemical compound made up of one nitrogen atom and 3 hydrogen atoms
  5. 8. a growth of abnormal tissue.