Solar System Crossword

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Across
  1. 4. The force of an object to pull another to itself
  2. 5. Not being harmful to the environment
  3. 7. Something that is made with two ore more substances mixed together
  4. 9. A planet of gas
  5. 10. Our solar system is a speak compared to our ________.
Down
  1. 1. The name of this Crossword
  2. 2. Separates the inner planets from the outer planets
  3. 3. Mass of air that surrounds Earth
  4. 6. The outermost layer of an object
  5. 8. A planet of ice