Solar System crossword puzzle

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Across
  1. 2. Neptune and Uranus are blue in colour because of the _____ in their atmosphere.
  2. 4. The inner planets are also known as _____ planets because they are primarily made of rocks and silicate.
  3. 5. The _____ belt is located between Mars and Jupiter.
  4. 8. This phenomenon is the reason that we always see the same side of the Moon. (2 words)
  5. 10. This planet with rings has the most number of moons in the Solar System.
  6. 12. This gas makes up most of Jupiter's mass.
Down
  1. 1. Compared to Mars, Earth's drifting ____ ____ are the reason for its active volcanism. (2 words)
  2. 2. Phobos and Deimos are irregularly shaped moons of _____.
  3. 3. The Solar System is almost 4.6 _____ years old.
  4. 6. All the planets in the Solar System orbit the Sun within 6° of the _____ plane.
  5. 7. There are _____ planets in the solar system.
  6. 9. This is the hottest planet in the Solar System even though it is not the closest one to the Sun.
  7. 11. _____ rotates on its side due to its 98° axis of rotation.