Across
- 2. sound basis
- 4. Large marsupial
- 5. evaluate nature
- 7. adding things together
- 9. Has a trunk
- 11. book
- 12. Man's best friend
- 13. facts or information
- 16. impossible to doubt
- 18. fight
- 19. Flying mammal
Down
- 1. establish truth
- 3. state
- 6. prove evidence
- 7. clearly defined
- 8. Likes to chase mice
- 10. thinking logically
- 14. form an idea
- 15. draw
- 17. prove to be wrong