Chapter 21 lesson 1-2 Crossword puzzle

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Across
  1. 2. Second planet from the sun
  2. 3. the fourth planet from the sun
  3. 6. time is takes an object to travel once
  4. 7. Millions of small rocky objects
  5. 9. a planets atmosphere traps solar energy
  6. 10. something we live on
Down
  1. 1. time it takes an object to complete on rotation
  2. 4. unit Distances are sometimes measured in meters
  3. 5. planets closets to the sun
  4. 8. made of gas dust and ice and moves around the sun in an oval shaped orbit