Across
- 4. Day and night are the main consequences.
- 6. A type of planets named for its rocky surface.
- 7. The coldest atmospheric layer.
Down
- 1. A type of planets named for its system rings, moons and low density.
- 2. This causes the four seasons.
- 3. It regulates the temperature and protects us from solar radiation.
- 5. Theory of our galaxy.