How Well Do You Remember the 1970s?

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Across
  1. 2. The king of rock and roll
  2. 4. Former worlds tallest building
  3. 5. Plastic fortune-telling sphere
  4. 7. A reflective nightclub decoration
  5. 12. Female tennis player in Battle of Sexes
  6. 14. Sony portable music player, 1979 launch
  7. 17. Computer software company founded in '75
  8. 18. First commercially successful video game
  9. 19. The weapon of a Jedi
Down
  1. 1. Olivia Newton-John and John Travolta
  2. 3. Queen's 1975 hit single
  3. 6. Pants with a flare below the knee
  4. 8. "You're going to need a bigger ___"
  5. 9. Shoe style with a 2-5 inch thick sole
  6. 10. Undefeated football team in 1972
  7. 11. "Stayin' Alive" (1977) by ______
  8. 13. Winners of 1974 Eurovision competition
  9. 15. Presidential scandal from 1972-1974
  10. 16. City where the 1972 Olympics were held
  11. 20. Natural style for Black curly hair