Across
- 3. the opposite of smooth
- 5. to watch carefully, to use the five senses carefully
- 7. nothing inside
- 9. something that can hold other things inside
- 11. to not believe, to not believe easily
- 12. a careful test to find out something we do not know
- 14. without any limits
- 15. the science that studies stars, planets, and the universe
Down
- 1. not together
- 2. cannot happen or be achieved
- 4. something that a person likes to do, but not for work or school
- 6. the study of living things
- 8. to show that something is true by using facts and logic
- 10. to let something out
- 13. without any space