4

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Across
  1. 2. - Large church (9 letters)
  2. 3. - Concealment technique (10 letters)
  3. 5. - Tropical storm (9 letters)
  4. 6. - System of stars (6 letters)
  5. 9. - Gelatinous sea creature (9 letters)
  6. 10. - Soft illumination (11 letters)
  7. 12. - Juicy fruit (10 letters)
  8. 17. - Notable feature (8 letters)
  9. 18. - Illumination from the sky (9 letters)
  10. 19. - Desert watering hole (5 letters)
Down
  1. 1. - Hidden riches (8 letters)
  2. 4. - Study of ancient artifacts (11 letters)
  3. 7. - Exciting journey (9 letters)
  4. 8. - Two-wheeled vehicle (7 letters)
  5. 11. - Long-distance race (8 letters)
  6. 13. - Celestial event (7 letters)
  7. 14. - Green vegetable (8 letters)
  8. 15. - Eye protection (10 letters)
  9. 16. - Explosive displays (9 letters)
  10. 20. - Three-dimensional art form (9 letters)