That Hazen Crossword

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Across
  1. 4. a mineral which grows when heated
  2. 6. the loose surface material that covers most land
  3. 7. The process of growing plants in sand, gravel or liquid, with added nutrients but without soil
  4. 9. a granular material that’s white in color
  5. 14. a hydroponic technique in which the plant stand in a shallow steam of water
  6. 15. a measure of how much oxygen is dissolved in the water
Down
  1. 1. a machine that measures the level of conductivity
  2. 2. a hydroponic method by means of suspending the plant roots in a solution of nutrient-rich, oxygenated water
  3. 3. a plant-cultivation technique in which the roots hang suspended in the air while nutrient solution is delivered to them in the form of a fine mist
  4. 5. the measure of ease at which an electrical charge can pass through a material
  5. 8. a scale used to specify acidity or basicity of an aqueous solution
  6. 10. Neither Positive nor negative
  7. 11. the level of acid in substances such as water, soil, or wine
  8. 12. a primary cell cultures prepared from dissociated fetal cells
  9. 13. a substance that provides nourishment