Chapter 21 lesson 1-2 crossword puzzle

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Across
  1. 2. the second planet from the sun.
  2. 5. objects in the solar system however are so far apart.
  3. 6. the inner planets mercury,venus,earth, and mars.
  4. 7. the fourth planets from the sun.
  5. 9. the high temperatures.
  6. 10. Earth has a period of one day.
Down
  1. 1. Earth's has a period around one year.
  2. 3. is the closed to the sun.
  3. 4. come from the outer parts of the solar system.
  4. 8. a dwarf planet orbit of planets do.