The Birth of the Earth

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Across
  1. 4. The state of water that can only be found on Earth.
  2. 6. The planets in our solar system ___________ around the sun.
  3. 8. A giant blanket of gas that surrounds Earth and protects it.
  4. 9. The gas we breathe.
  5. 11. The third planet from the sun.
Down
  1. 1. One of the first gases to form.
  2. 2. A dwarf planet that was once considered a planet.
  3. 3. An explosion that gave rise to the Universe.
  4. 5. A spectacular explosion that happens when a star blows up.
  5. 7. The collection of the eight planets that surround the sun, including Earth.
  6. 10. Giant balls of blazingly hot gases.