General science

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Across
  1. 5. What chemical process occurs in cells to release energy?
  2. 7. hardest substance on earth
  3. 8. SI unit of frequency is?
  4. 9. Instrument used to scatter white light into its constituent colours
  5. 10. smoking causes_________?
Down
  1. 1. longest cell in human body
  2. 2. It regulates the amount of light that enters the eye
  3. 3. Sound does not travel in_________
  4. 4. Which lens is used in magnifying glass
  5. 6. largest moon of saturn