Earth and her neighbors

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Across
  1. 4. One of the 4 states of things. Not liquid, not solid. It has no shape but it can fill up a balloon.
  2. 6. You can see it almost every night.
  3. 7. Rocks from space that land on a planet.
  4. 9. A small, tiny piece of something.
  5. 11. This verb means to spin around.
  6. 13. The largest planet in our solar system.
Down
  1. 1. Tells us how hot or cold something is.
  2. 2. A big round hole on a planet or moon caused by something from space crashing into the planet/moon.
  3. 3. A big lump of dirty ice flying through space. They have tails.
  4. 5. This layer of gas around our planet keeps the warmth in.
  5. 8. A big rock flying through space but not a planet.
  6. 10. The hottest planet in our solar system.
  7. 12. It's all around us, we need it to breathe and to live.