Across
- 1. the inner planets are all terrestrial and are made of
- 5. The curved path of a celestial object around a star, planet, or moon
- 8. To decay or break down a substance
- 10. A substance produced in a chemical reaction
- 11. To keep the same or to preserve
- 12. A substance that takes part in a chemical reaction
- 14. the outer planets are all bigger in size and are made of
Down
- 2. The process of burning something (reacting it with oxygen)
- 3. An object that orbits a planet, star or moon. It can be man-made or natural
- 4. How the sun's rays when they hit the earth during summer months
- 6. objects made up of rock, ice and dust that orbit the sun
- 7. all existing matter and space considered as a whole
- 9. A substance such as coal or gas that is burned to produce energy
- 13. an imaginary line about which a body rotates.