Light

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Across
  1. 3. opaque
  2. 6. solar power
  3. 8. bioluminescence
  4. 10. transparent
  5. 11. colour
  6. 12. rainbow
Down
  1. 1. translucent
  2. 2. spectrum
  3. 4. refraction
  4. 5. reflection
  5. 7. light
  6. 9. ultraviolet