Unsolved Mystery Words

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Across
  1. 3. possibly true
  2. 7. trick
  3. 8. to have formed ideas about something
  4. 9. taken away by force
  5. 12. the time before written facts
  6. 13. keeping watch over
  7. 14. said to be true without facts
  8. 15. unable to be explained by science
Down
  1. 1. tasks that have been completed successfully
  2. 2. to give more information
  3. 4. people who study human remains of people that lived long ago
  4. 5. someone who studies physics
  5. 6. from outside of Earth
  6. 10. unusual facts that are difficult to explain
  7. 11. a long-neck marine animal from the Jurasic period