Unit 10 Mysteries

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Across
  1. 2. an observable fact or event
  2. 5. flat, rectangular piece of material
  3. 6. research projects, studies
  4. 7. one that marks
  5. 9. clues or signs that something is true
  6. 10. to challenge mentally
  7. 11. a subject to death
Down
  1. 1. make guesses about something
  2. 3. from another planet
  3. 4. very large
  4. 8. show something, make people aware