Across
- 4. gas giant planets
- 6. meteor that makes it to earth without burning up
- 8. huge chunks of irregularly shaped rocks
- 10. small pieces of rock and dust
- 12. once considered the ninth planet
- 13. has methane in its atmosphere
Down
- 1. has most extreme temperature ranges
- 2. dirty snowballs
- 3. four planets closest to the sun
- 5. farthest planet from the sun
- 7. meteoroids that enter earth's atmosphere and burn
- 9. second largest planet
- 10. looks red because of iron oxide
- 11. smallest of the planets