Plants and Planets

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Across
  1. 3. to prepare food in the presence of light
  2. 5. the natural satellite of the Earth
  3. 6. the number of planets in the solar system
  4. 8. turns bluish-black in the presence of starch
Down
  1. 1. the green pigment in plants
  2. 2. performs photosynthesis in cactus
  3. 4. a planet with rings
  4. 7. the innermost layer of the Earth