Across
- 5. changing a planet to make it livable.
- 6. the top of a planet's ground.
- 7. the center of a planet
- 10. The larger of Mars's moons.
- 12. a planet's climate changing either for the better or worse.
- 13. a planet's air
- 15. the fourth planet from the sun.
Down
- 1. A canyon on the equator of Mars.
- 2. A full rotation around the sun by earth.
- 3. The furthest moon from mars.
- 4. A planet with a surface.
- 8. The largest volcano in the Milky Way.
- 9. Floating space rock orbiting a planet
- 11. large amounts of it is on earth
- 14. the planet that humans currently inhabit.