Chapter 21 Lesson 1-2 Crossword Puzzle

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Across
  1. 2. The Earth's is a mixture of gases and small amounts of water vapor.
  2. 7. There are four of these one being the Earth
  3. 9. Between the orbits of two planets.
  4. 10. Made of gas, dust, and ice.
Down
  1. 1. Takes Earth about 24 hours.
  2. 3. Takes Earth 1 year.
  3. 4. 1 of these is the distance from the Earth to the Sun.
  4. 5. Helps keep Earth warm enough for life to exist.
  5. 6. The inner and outer core of the planets.
  6. 8. We have eight of them in our solar system.