Magnetism and electricity.

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Across
  1. 3. when two opposite charges rub.
  2. 4. give off negative charges.
  3. 5. give off positive charges.
  4. 7. the attraction of two forces.
  5. 8. a burst of electricity.
Down
  1. 1. a charge of energy.
  2. 2. these attract.
  3. 6. don't give off charges.