Chapter 21 lesson 1-2 Crossword Puzzle

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Across
  1. 3. what is in mars's soil that makes it a reddish color
  2. 4. the average distance from Earth to the sun
  3. 5. planets planets made of rock and metal with a solid outer layer
  4. 7. What is the the time it takes an object to make a complete rotation called?
  5. 9. What is made of gas, dust and ice and moves around the sun in oval orbit?
Down
  1. 1. What occurs when a planet's atmosphere traps the suns heat and causes the planet to heat up?
  2. 2. The time it takes an object to travel around the sun once
  3. 6. what is the closest planet to the sun?
  4. 8. What are small rocky objects that orbit the sun between Mars and Jupiter?
  5. 10. planet that is half the size of Earth