The Inner Planets

12345678910
Across
  1. 1. The diameter of this planet is 12,756
  2. 8. These planets are made of rock and metal and have solid outer layers.
  3. 9. The largest mountain in the solar system.
  4. 10. The atmosphere of this planet contains 95% carbon dioxide.
Down
  1. 2. These are the gases that covers the planets and keep them warm.
  2. 3. One of the largest impact crater in the solar system.
  3. 4. This planet's surface is covered with solidified lava.
  4. 5. This is the outer layer of the planet.
  5. 6. It is the only planet without and atmosphere.
  6. 7. It is the reason why mars looks red.