Ash crossword puzzle ninjas

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Across
  1. 2. another word for minus.
  2. 4. a big wave.
  3. 5. a body of water or air.
  4. 6. important bit of the story.
Down
  1. 1. a loud struck in the sky.
  2. 3. another word for plus.
  3. 4. impact on an object.