Jo's 60th Birthday - Some of the answers are titles of books, find the books and find and arrange the the snippets, there are 9 books. Other answers might be clues as well

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Across
  1. 3. What revealed the West gate of Moria
  2. 5. The science of movement, where anatomy meets motion and performance
  3. 7. What planet is known as the Red Planet
  4. 8. Balance in sound or agreement in spirit
  5. 9. Small in size, big in heart, and always up for an adventure
  6. 15. Who painted the Mona Lisa
  7. 16. What theory explains the origin of the universe
  8. 17. What Shakespeare play features the line To be or not to be
  9. 18. What is the longest river in the world
  10. 20. sean connery starred underwater with Claudine Auger
  11. 25. What gas do humans need to survive
  12. 26. A animal known for its humps
  13. 31. What process do plants use to convert sunlight into energy
  14. 33. What measures distance east or west of the Prime Meridian
  15. 34. Who formulated the laws of motion
  16. 35. Which philosopher was a student of Plato and tutor to Alexander the Great
  17. 37. Who proposed that the Earth orbits the sun
  18. 41. What mountain is famous for being the highest point on Earth
  19. 43. What is the lightest element in the periodic table
  20. 44. Stories which include Ali Baba
  21. 46. a small songbird with striking yellow plumage, known for its cheerful call and association with resilience and beauty
  22. 47. True story about a beloved British comedian, actress, and author, known for her wit and charm in 'The Vicar of Dibley
Down
  1. 1. A lush refuge where life blooms amidst the barren land
  2. 2. Who introduced a sequence where each number is the sum of the two preceding ones
  3. 4. Mounds of sand formed by the wind
  4. 6. Who invented the printing press
  5. 10. A forbidden love story, entwined with the pain of longing and the resilience of the Australian outback
  6. 11. What inventor is associated with alternating current electricity
  7. 12. Who proposed the theory of evolution by natural selection
  8. 13. Who composed The Magic Flute
  9. 14. What battle marked the end of Napoleon's rule
  10. 19. What molecule carries genetic instructions in living organisms
  11. 21. What astronomical phenomenon has gravity so strong that even light cannot escape
  12. 22. Who developed a theorem about right-angled triangles
  13. 23. What document, signed in 1215, limited the powers of the English king
  14. 24. A gripping mystery entwined with dark secrets and long-buried truths
  15. 27. What is the largest rainforest in the world
  16. 28. What region surrounds the North Pole
  17. 29. Who wrote Romeo and Juliet
  18. 30. What ocean separates Europe and North America
  19. 32. Who composed the 9th Symphony
  20. 34. A paperback opener for frosty conversations or frozen waters
  21. 36. What is the highest mountain on Earth
  22. 37. What element is the basis of all known life
  23. 38. What flightless bird is native to Antarctica
  24. 39. What legendary castle is associated with King Arthur
  25. 40. What plant is the main diet of pandas
  26. 42. What ship sank in 1912 on its maiden voyage
  27. 45. Who improved the telescope and supported the heliocentric theory