Across
- 3. Disadvantage or problem
- 5. a lot of them goes around the Earth
- 8. very difficult
- 10. a claim that backs up with evidence to prove others
- 11. unable to guess
- 13. rare, hard to find
- 16. rock in space
- 17. to put in work
- 18. 8 of these are in the solar system
- 19. want to learn
Down
- 1. The weather is getting more extreme
- 2. the long term of weather
- 4. ancient animals
- 6. machines made by human
- 7. exciting experience
- 9. productive with little waste
- 12. a person in space
- 14. where we live
- 15. National Aeronautics and Space Administration