3

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Across
  1. 2. - Largest planet (7 letters)
  2. 4. - Tall landform (8 letters)
  3. 7. - Festive celebration (8 letters)
  4. 8. - Exciting journey (9 letters)
  5. 9. - Fastest land animal (7 letters)
  6. 10. - Orchestral composition (8 letters)
  7. 11. - Tall yellow flower (9 letters)
  8. 13. - Cascading stream (9 letters)
  9. 14. - Rain protection (8 letters)
  10. 17. - Word reference (10 letters)
  11. 19. - Team sport (10 letters)
  12. 20. - Illumination from the sky (9 letters)
Down
  1. 1. - Space traveler (9 letters)
  2. 3. - Sparkling wine (9 letters)
  3. 5. - System of stars (6 letters)
  4. 6. - Tropical fruit (9 letters)
  5. 12. - Animal kingdom (8 letters)
  6. 15. - Insect with colorful wings (9 letters)
  7. 16. - Spicy bark (8 letters)
  8. 18. - Musical beat (7 letters)