Bryttoni unit 8 crossword puzzle

123456789101112131415161718192021
Across
  1. 2. pollution from one place
  2. 5. one of earth's major issues
  3. 7. used as a energy source
  4. 8. organized facilities
  5. 9. area with buildings and less greenery
  6. 10. messes with your nervous system
  7. 13. affects embryos
  8. 16. a disease that can spread
  9. 18. "reliable" agriculture
  10. 21. a disease with "late symptoms
Down
  1. 1. growth of urbanization
  2. 3. area with farms and agriculture
  3. 4. source pollution pollution coming from no specifc place
  4. 6. growing crops closely
  5. 11. something being released into the air
  6. 12. a whole in the barrier between earth and space
  7. 14. using a septic tank in farming
  8. 15. island when heat is only in one area
  9. 16. watering through a system
  10. 17. causes cancer
  11. 19. pollution causes air quality to lower
  12. 20. taking up an area