Summer

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