Crossword

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Across
  1. 2. Adventure from one place to another (7 letters)
  2. 4. A reduced price.(8 letters)
  3. 6. When something does not have a cost. (4 letters)
  4. 7. Someone who knows a lot about something. (6 letters)
  5. 9. When something is very loud. (5 letters)
  6. 10. The opposite of indoors. (7 letters)
Down
  1. 1. Someone who goes to space in a rocket. (7 letters)
  2. 3. The entire planet where we live (5 letters)
  3. 5. Researcher in a lab (9 letters)
  4. 8. Black and white bird that can't fly (7 letters)