Wed Lock Wordplay

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Across
  1. 5. gas that lights up signs
  2. 7. period following twilight
  3. 8. Wise figure in Middle-earth
  4. 9. to go up, or increase
  5. 10. Place to admire Monet and Picasso
  6. 12. Ancient source of prophetic wisdom
  7. 15. Legendary ghost ship doomed to sail the oceans forever
Down
  1. 1. sweltering summer, or a time of struggle
  2. 2. To harden or turn into a solid state
  3. 3. Composer known for a deafening symphony
  4. 4. longest african river
  5. 6. Scandinavian country known for its dramatic landscapes
  6. 11. Essential part of a spacecraft's structure
  7. 13. Tragic Moor of Venice, or nostalgic board game
  8. 14. Tree that might house a squirrel
  9. 16. often found in a vault