Across
- 3. planets four of the closest planets to the sun
- 5. a thing that has a relation to a whole
- 7. you can live on it
- 11. air that surrounds earth,mainly oxygen and nitrogen
- 12. a group of parts that interact together
- 14. a rate of something
- 15. the strength to do that needs vitality and physical power
- 17. a unit of measuring something
Down
- 1. the thing that separates the rocky planets and gas planets
- 2. transparent liquid
- 4. spherical concentric regions that make up earth
- 6. Earth's sister
- 8. nearest satellite to earth
- 9. very hot rocks
- 10. part of earth where water is
- 13. part of earth where life exists
- 16. a number that has two separate numbers on top and bottom