Chapter 21 Lesson 1-2 Crossword Puzzle

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Across
  1. 2. A planet must have a big enough mass to have this.
  2. 5. Only called this if it orbits the Sun, and has a nearly spherical shape.
  3. 6. There is 1 trillion of these orbiting the Sun, in an oval-shaped orbit.
  4. 7. What takes Earth one year?
  5. 9. These are also called gas giants.
  6. 10. What are also called terrestrial planets?
Down
  1. 1. What causes the surface temperature to increase on a planet.
  2. 3. What takes Earth one day?
  3. 4. These planets included Mercury, Venus, Earth, and Mars.
  4. 8. What do you call small rocky objects, that aren't usually spherical?