Across
- 2. What is the smallest planet in the Solar System?
- 5. What gas gives Uranus and Neptune their blue color?
- 6. What is the largest planet in the Solar System?
- 7. What is the term for a planet’s path around the Sun?
- 8. What is the “Red Planet”?
Down
- 1. What gas causes Venus’s extreme greenhouse effect?
- 3. What are planets like Jupiter and Saturn called?
- 4. What type of planets are Mercury, Venus, Earth, and Mars?