Inner Planets Crossword Puzzle

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