Bizarre world

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Across
  1. 3. Electricity which you see in the sky before you hear
  2. 4. Piece of shining celestial matter
  3. 6. Imaginary shape out of a collection of stars
  4. 9. Gum that expands on blowing
  5. 12. Spinning column of sand and wind
Down
  1. 1. A triangle where things are seen to disappear
  2. 2. Living things emitting light
  3. 4. a thing about snow that is unique
  4. 5. A person who can have onion breakfast, lunch and dinner
  5. 7. A hole in which matyer disappears
  6. 8. Ice that doesn't melt
  7. 10. A mountain that spews fire
  8. 11. Horse with a horn