18

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Across
  1. 4. - Marsupial native to Australia (8 letters)
  2. 6. - Violent windstorm (7 letters)
  3. 9. - Bright celestial object (6 letters)
  4. 12. - Smooth stone (6 letters)
  5. 13. - Colorful talking bird (6 letters)
  6. 15. - Electric discharge during a storm (10 letters)
  7. 17. - Spice derived from tree bark (8 letters)
  8. 18. - Citrus fruit (6 letters)
  9. 19. - Tall African mammal (7 letters)
Down
  1. 1. - Cascading stream (10 letters)
  2. 2. - Illumination from Earth's satellite (9 letters)
  3. 3. - Yellow fruit (6 letters)
  4. 5. - Red, juicy fruit (10 letters)
  5. 7. - Large reptile (9 letters)
  6. 8. - Small, nectar-feeding bird (11 letters)
  7. 10. - Largest planet in the solar system (7 letters)
  8. 11. - Eighth planet from the sun (7 letters)
  9. 14. - Insect with delicate wings (10 letters)
  10. 16. - Massive floating block of ice (7 letters)
  11. 18. - Eight-armed sea creature (7 letters)