17th one

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Across
  1. 3. - Multicolored meteorological phenomenon
  2. 7. - Lush, biodiverse ecosystem
  3. 11. - Sweet cacao-based treat
  4. 12. - Agile flying insect
  5. 14. - Natural underground hollow
  6. 15. - Scientific magnification tool
  7. 19. - Arid, sandy terrain
  8. 20. - Valuable hidden bounty
  9. 21. - Cascading natural wonder
  10. 22. - Edge of a flowing watercourse
  11. 24. - Common yellow wildflower
  12. 25. - Morning's first light
Down
  1. 1. - Long-necked African mammal
  2. 2. - Lowland between hills or mountains
  3. 4. - Natural cascading wonder
  4. 5. - Bravery in battling blazes
  5. 6. - Seaside sandy shore
  6. 8. - Exciting journey or quest
  7. 9. - Inflatable seaside toy
  8. 10. - Wooded, natural area
  9. 13. - Small, still
  10. 16. - Vast marine expanse
  11. 17. - Larval stage of a butterfly
  12. 18. - Earth's elevated landform
  13. 23. - Delicate, winged insect