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Across
  1. 4. Island nation in Indian Ocean
  2. 6. Active Sicilian volcano
  3. 8. Related to deltas
  4. 9. Island in Mediterranean
  5. 10. Mountains in Central Asia
  6. 12. Eastern US mountain range
  7. 16. Australian island
  8. 17. Mountains between Spain, France
  9. 18. Tropical grassland
  10. 20. Western North American range
  11. 23. Land weathering process
  12. 25. Southeast European region
  13. 27. Island south of India
  14. 28. World's second-highest peak
  15. 30. Mountains dividing Europe, Asia
Down
  1. 1. Islands of unique wildlife
  2. 2. Tallest US mountain
  3. 3. Mountain range in Europe
  4. 5. Spanish word for mountains
  5. 7. Cold treeless biome
  6. 11. Iconic Japanese volcano
  7. 13. Mountains in North Africa
  8. 14. Greek mythology mountain
  9. 15. Mountain in Washington
  10. 19. Volcano in Italy
  11. 21. Hawaii's massive volcano
  12. 22. Glacier-deposited debris
  13. 24. South African mountain range
  14. 26. Highest South American peak
  15. 29. Small Mediterranean island