chapter 21 crossword puzzle

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Across
  1. 5. How much time time it takes to travel around the sun once
  2. 6. Million of small, rocky objects
  3. 8. The Is the average distance
  4. 10. What traps the solar heat in planets
Down
  1. 1. how much the time it takes to make one orbit
  2. 2. It is 97 percent carbon dioxide
  3. 3. waht are planets closest to the sun
  4. 4. made of gas, dust, and ice
  5. 7. A spherical object
  6. 9. Has no atmosphere