Chain Crosswords Long Nature Medium — Set 2

Medium 13×13 Set 2
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2
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7
8
9
Across
  1. 1. Relating to sight or light
  2. 3. A word related to science
  3. 4. A word related to science
  4. 7. Glass that splits light into colors
  5. 8. Biological classification rank
  6. 9. Focused beam of coherent light
Down
  1. 1. Path around a celestial body
  2. 2. Elementary particle in protons
  3. 5. Compound of oxygen and another element
  4. 6. A word related to science