Gardening Crossword Puzzle

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Across
  1. 3. growing plants in an urban environment
  2. 4. 5 letters, starts with W, ends with S
  3. 8. process of nitrogen moving through living and non-living things
  4. 10. air + water + minerals + humus
  5. 12. found in soil and rock as calcium phosphate
  6. 14. result of germination
  7. 17. food storage for seed embryo
  8. 20. substance used for killing pests
Down
  1. 1. top layer of soil
  2. 2. increase of salt concentration in soil/sounds like sanitization
  3. 5. displacement of topsoil
  4. 6. plant embryo shell
  5. 7. supply of water to land or crops by channels
  6. 9. organic material called "black gold"
  7. 11. one of the best coverings for soil
  8. 13. first root to exit seed embryo
  9. 15. process of embryo changing to seedling
  10. 16. chemical/organic material added to soil
  11. 18. process of phosphorus moving through the lithosphere, hydrosphere, and biosphere
  12. 19. essential element that is 78% of the atmosphere