6

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Across
  1. 3. - Cascading stream (10 letters)
  2. 6. - Hidden riches (8 letters)
  3. 8. - Large mammal with tusks (8 letters)
  4. 10. - Long-distance running race (8 letters)
  5. 12. - Astronomy enthusiast (9 letters)
  6. 16. - Explosive displays (9 letters)
  7. 18. - Sweet treat (9 letters)
  8. 19. - Violent windstorm (7 letters)
  9. 20. - Insect with colorful wings (10 letters)
Down
  1. 1. - Space explorer (9 letters)
  2. 2. - Aerial descent device (9 letters)
  3. 4. - Bright yellow flower (9 letters)
  4. 5. - Photography device (6 letters)
  5. 7. - Pollinating insect (8 letters)
  6. 9. - Wax stick for illumination (6 letters)
  7. 11. - Festive celebration (8 letters)
  8. 13. - Exciting journey (9 letters)
  9. 14. - Colorful meteorological display (7 letters)
  10. 15. - Flying insect with transparent wings (9 letters)
  11. 17. - Evening phenomenon (6 letters)