science vocab crossword puzzle

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Across
  1. 2. a particle representing a quantum of light
  2. 4. the distance between a wave
  3. 5. allows light but not detailed shapes
  4. 7. the process which one thing absorbs another
  5. 8. the spreading of something
Down
  1. 1. an object that lets light pass through
  2. 3. not able to see through
  3. 6. the act of transmitting something