Quarterly Crossword Review

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Across
  1. 2. lives on the roots of plants and create nitrates
  2. 5. the process where plants absorb nitrates from the soil
  3. 8. 78% of the atmosphere
  4. 10. third layer of the atmosphere
  5. 12. contains the ozone layer
  6. 13. when water is filled with fertilizer and runs into waterways causing algae blooms
  7. 14. substance that is used to make shells
Down
  1. 1. a substance farmers use to put more nitrogen in the soil
  2. 3. the first layer of the atmosphere
  3. 4. causes nitrogen to mix with oxygen to create a usable compound
  4. 5. the height of an object
  5. 6. this process makes a usable compound
  6. 7. removing carbon from the atmosphere
  7. 9. a process used by plants to make sugars and oxygen
  8. 11. fourth layer of the atmosphere