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