The Twenty One Balloons

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Across
  1. 4. is a retired arithmetic teacher
  2. 7. on the Atlantic with 21 deflated balloons
  3. 9. an island full of great wealth and fantastic inventions
  4. 10. established a wealthy and fanciful colony
  5. 11. destroyed the Pacific island of Krakatoa in 1883
  6. 12. tells something about nostalgia and about moving on
Down
  1. 1. decided to work with the professor to save the lives of everyone on the island
  2. 2. portrayed intelligent and generally
  3. 3. invented their own form of amusement
  4. 5. the nature of the journey on which to embark
  5. 6. left on a balloon to escape his mundane life of teaching
  6. 8. known as indonesia