Bestest Crossword Ever

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Across
  1. 3. Mars is named after the Roman god of ____
  2. 6. 4th planet from the sun
  3. 10. One Mars year is 687 _________
  4. 13. The 3rd planet from the sun
  5. 14. When the orbit of another planet lines it up in the opposite direction of the sun as seen from Earth
  6. 15. The 3rd layerof Earth
Down
  1. 1. Extends the length of Europe and has depths of up to four and a half miles
  2. 2. The hypothetical process of deliberately modifying a planet’s atmosphere,temperature, surface topography or ecology to be similar to the environment of Earth to make it habitable by Earth-like life
  3. 4. A very large shield volcano mountain on the planet Mars
  4. 5. One of the three space rovers to land on Mars in 2021
  5. 7. The Earth and Mars become their closest every 26 _____
  6. 8. The larger of Mar's moons
  7. 9. Ice found at the poles and beneath some of the surface of Mars
  8. 11. Mars gets it red color from ____ oxide
  9. 12. The smaller of Mars' moons