Chapter 21 Lesson 1-2 Crossword Puzzle

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Across
  1. 6. The four planets farthest from the sun are called
  2. 8. What is the time it takes for an object to to spin around completely called
  3. 9. What is the time it takes for an object to revolve around something called
  4. 10. What are made of gas, dust, and ice and revolve around the sun
Down
  1. 1. What are made of rock and ice and are smaller then Earth
  2. 2. What are the four largest moons of Jupiter called.
  3. 3. A rocky object that revolves around the sun in the asteroid belt is called
  4. 4. The four planets closest to the sun are called
  5. 5. What is the unit that scientist use to calculate the distance between planets and the sun
  6. 7. What is it called when planet's atmosphere traps in solar energy