Solar radiation and its hygienic significance

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Across
  1. 1. What is the process of using sunlight to purify water called?
  2. 5. What is the primary source of solar radiation?
  3. 6. Which pigment in the skin protects against UV radiation?
  4. 7. Which layer of the atmosphere filters harmful UV rays?
  5. 8. What type of UV radiation has the strongest germicidal effect?
Down
  1. 2. What is the term for the beneficial killing of microorganisms by sunlight?
  2. 3. What is the term for solar-induced inflammation of the skin?
  3. 4. Excessive exposure to UV radiation can lead to what type of cancer?
  4. 8. Which wavelength range is responsible for erythema (sunburn)?