Across
- 4. — Warm covering for a bed
- 6. — Very large natural elevation
- 7. — Fortified residence for royalty
- 9. — Tool used for navigation
- 13. — Slow-moving mass of ice
- 14. — Brain-teasing problem or game
- 15. — Portable source of light
- 16. — Sharp, high-pitched sound
- 18. — Streak of light from space debris
- 19. — Mountain that erupts lava
Down
- 1. — Sound following lightning
- 2. — Fast bird of prey
- 3. — Valuable hidden riches
- 5. — Desert plant with spines
- 8. — Long journey, especially by sea
- 10. — Sea robber from old tales
- 11. — Place filled with books
- 12. — Dense tropical forest
- 17. — Pleasant combination of sounds
- 20. — Path around a planet or star