The Perfect Planet

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Across
  1. 2. A word that means "just right"
  2. 7. Without its perfect features, Earth would simply be a ____.
  3. 8. Made of about 90% water
  4. 10. Earth contains many of these, like oxygen and carbon dioxide
  5. 11. On Mars the ______ can drop to -220!
  6. 13. A word that means "to control or maintain"
Down
  1. 1. A word that means "plenty" or "more than enough"
  2. 3. The air that surrounds Earth
  3. 4. Earth has a _______ that can support life
  4. 5. An asteroid approaches Earth every year, but it ____ up before reaching Earths surface
  5. 6. Covers more than half of Earths surface
  6. 9. The only planet that can support life
  7. 12. Earth is the perfect distance from this object