Electriciry and its Discovery

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Across
  1. 2. the flashing of light produced by a discharge of atmospheric electricity
  2. 3. to find knowledge for the first time
  3. 5. a definite quantity of electricity
  4. 6. to move along the surface with pressure
  5. 8. a known object or a fact
Down
  1. 1. a storm accompanied by lightning and thunder
  2. 4. to watch carefully with attention
  3. 7. hard yellow fossil resin that takes a fine polish and is used in making ornamental objects