Earth & Mars crossword

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Across
  1. 4. The biggest canyon in the solar system
  2. 5. The outer most part of Earth
  3. 10. The biggest volcano in the entire solar system
  4. 13. The gas that mainly makes up Mars atmosphere
  5. 15. The area between the crust and outer core
Down
  1. 1. how long is a year on Mars? (Earth Days)
  2. 2. How long is a day on Mars? (EX: 72hrs29mins)
  3. 3. It is the only planet in the solar system to be sustainable for life
  4. 6. Known as the "Red Planet"
  5. 7. How many moons does mars have? (Write in word form)
  6. 8. What is the name for the big landforms on Earth?
  7. 9. What Roman God was Mars named after?
  8. 11. What is the gas that makes up 21% of Earth's atmosphere?
  9. 12. The closets Earth and Mars will get every 26 months
  10. 14. The inner most part of Earth