Across
- 1. Water once existed on Mars in ______ form
- 3. Opposite of thick (describing Mars’ atmosphere)
- 6. One of Mars’ small moons (6 letters)
- 10. The Roman god Mars was the god of ______
- 11. Frozen caps found at the top and bottom of Mars
- 12. A gas layer surrounding a planet
- 14. The star at the center of our solar system
- 15. Mars is called the “Red ______”
- 16. Large bowl-shaped holes from impacts
- 19. NASA mission that included Spirit and Opportunity
Down
- 2. The other moon of Mars (6 letters)
- 4. The time it takes a planet to spin once
- 5. Frozen water found at the poles
- 6. Machine sent into space to study planets
- 7. The red color comes from iron ______
- 8. The fourth planet from the Sun
- 9. Valleys,deserts, and craters are types of surface ______
- 13. Natural satellite of a planet
- 17. Robot vehicles sent to explore Mars
- 18. Giant mountains that can erupt