Across
- 1. sound basis
- 3. clearly defined
- 6. form an idea
- 8. facts or information
- 9. prove evidence
- 10. impossible to doubt
- 12. thinking logically
- 14. adding things together
- 15. book
Down
- 2. draw
- 4. evaluate nature
- 5. establish truth
- 7. prove to be wrong
- 11. state
- 13. fight