Across
- 4. An imaginary line dividing the Earth into northern and southern halves
- 6. A substance that can wear away or destroy materials
- 7. A substance that is sour and can react with metals
- 11. A measure of how hot or cold something is
- 13. When one celestial body moves into the shadow of another
- 14. The path one object takes around another in space
Down
- 1. The movement of one object around another in a circular path
- 2. When day and night are nearly the same length
- 3. A substance that feels slippery and tastes bitter
- 5. The spinning of an object on its axis
- 8. reaction A process where substances change to form new substances
- 9. Half of the Earth, divided by the equator
- 10. Neither an acid nor a base
- 12. tilt The angle at which a planet's axis is tilted