Across
- 1. earth science
- 3. Our Planet
- 4. The fifth planet
- 7. the force that attracts a body toward the center of the earth
- 9. a basis for reasoning
- 12. the process of eroding or being eroded by wind, water, or other natural agents
- 14. state of matter
- 15. a group of atoms bonded together
- 16. about the same mass as a proton but without an electric charge
- 17. space rocks
- 19. state of matter
- 20. state of matter
Down
- 2. looking at something to gain information
- 5. a small body of matter from outer space that enters the earth's atmosphere
- 6. systematic investigation
- 8. Only Saturn has..
- 10. positive electric charge
- 11. space research
- 13. based on or characterized by the methods and principles of science
- 18. facts and statistics