Inner Planets Crossword Puzzle

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Across
  1. 3. Our home planet and 3rd closest to the sun.
  2. 5. The number of inner planets.
  3. 8. Venus is often called _____'_ ____.
  4. 9. Often called the red planet and last inner planet.
  5. 10. The hottest planet and 2nd closest to the sun.
Down
  1. 1. Evidence that _____ was once on Mars.
  2. 2. The inner planets are often called ___________ planets.
  3. 4. The inner planets have few to none _____.
  4. 6. The planet closest to the sun.
  5. 7. The inner planets __________ ranges from none to very thick.