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Science cross puzzle

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Across
  1. 1. study of navigation through air or space
  2. 5. study of plant nutrition; soil yields
  3. 7. study of algae
  4. 9. study of productivity of land
  5. 11. science or study of gliding
  6. 12. study of mites
  7. 13. study of truth
  8. 16. study of aerolites; meteorites
  9. 18. science of air pressure; art of ballooning
  10. 20. study of glands
  11. 21. study of agricultural soils
  12. 22. science of pleasure and pain
Down
  1. 2. dynamics of gases; science of movement in a flow of air or gas
  2. 3. science or study of grasses
  3. 4. study of the atmosphere
  4. 6. grammar book; science of inflections in grammar
  5. 8. study of medical remedies
  6. 10. collecting of air-mail stamps
  7. 13. science of sound
  8. 14. study of airborne organisms
  9. 15. the comparative study of primitive peoples
  10. 17. therapeutics
  11. 18. science of generative organs
  12. 19. art and theory of prize-fighting