Forms of energy

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Across
  1. 4. Zap!
  2. 7. Bouncing ball
  3. 8. Bright room
  4. 9. Fuelling your car
Down
  1. 1. Uranium
  2. 2. Falling apple
  3. 3. Riding a bike
  4. 5. Hot potatoes
  5. 6. Battery