Gunpowder in ancient China

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Across
  1. 4. in a firework and in outer space
  2. 6. inventors of gunpowder
  3. 7. used to make fireworks and invented by ancient Chinese alchemists
Down
  1. 1. what did the ancient Chinese call gunpowder
  2. 2. components:stars, gunpowder, fuse, charge
  3. 3. makes the firework explode in the sky- not in your hand
  4. 5. ancient rockets were made out of this