Inner planets

12345678
Across
  1. 2. Inner planets can generate it.
  2. 4. There is lava inside this.
  3. 7. Inner planets are _____ than outer planets.
  4. 8. The Red Planet.
Down
  1. 1. Inner planets are composed of these.
  2. 3. The hottest planet in the Solar System.
  3. 5. The only planet with life on it.
  4. 6. The closest planet to the Sun.