Inner Planets

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Across
  1. 3. Who has found evidence that there may have been once water on mars
  2. 4. Has almost no atmosphere
  3. 6. What planet's diameter is 12,712 km
  4. 7. Ranges in thickness and composition, is made up of gases, and can change as a result of sunlight
  5. 8. Mercury, Venus, Earth, and Mars
  6. 9. ”To move repeatedly around”
Down
  1. 1. This planet's atmosphere is contained of mostly carbon dioxide.
  2. 2. A planet that is like the Earth in some ways
  3. 4. A celestial object that orbits a planet
  4. 5. What planet's diameter is 143,000 km