mega- & super-

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Across
  1. 3. a cone-shaped device that amplifies voices
  2. 4. a wide and fast roadway
  3. 6. fictional champion with superhuman powers
  4. 7. large store selling food and household items
  5. 8. a very powerful nation that can influence other nations
  6. 9. something extremely popular with the public
Down
  1. 1. a unit of computer information storage capacity
  2. 2. a part of a person's mind that relates to attitudes about what is right and wrong and to feelings of guilt
  3. 5. something that is beyond what people are naturally able to do
  4. 6. a very popular actor or famous person