Why Is Blue So Rare In Nature?

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Across
  1. 3. Cause of reds in birds
  2. 4. Common creator of green in plants
  3. 8. Purple fruits mistaken for blue
  4. 9. Most common blue dye
  5. 10. Wavelength; 450-495 nm
  6. 11. Commonly associated emotion/mental state?
  7. 12. Popular synthetically produced blue pigment
Down
  1. 1. A nickname for Ultramarine
  2. 2. Popular small blue flowers associated with remembrance
  3. 5. "Blue stone"
  4. 6. Rare event in which an extra full moon appears
  5. 7. High or low energy?
  6. 13. We see whatever color is ____
  7. 14. PH value needed to present blue