6th one

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Across
  1. 3. - Biodiverse, lush ecosystem
  2. 4. - Explosive displays of light
  3. 6. - All of space and time
  4. 10. - Water safety supervisor
  5. 11. - Eye protection from the sun
  6. 12. - Sweet cacao-based treat
  7. 15. - Cascading natural wonder
  8. 17. - Device for cosmic observation
  9. 18. - Bravery in battling blazes
  10. 19. - Long-necked African mammal
  11. 20. - Transparent painting technique
Down
  1. 1. - Sweet, red berry
  2. 2. - Tropical, spiky fruit
  3. 5. - Eye protection from the sun
  4. 7. - Celestial nighttime radiance
  5. 8. - Inflatable seaside toy
  6. 9. - Exciting and daring journey
  7. 13. - Play area for children
  8. 14. - Bright, sun-facing garden bloom
  9. 16. - Rotary-wing aircraft