Unusual Phenomena

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Across
  1. 2. – Complex form of superior mirage
  2. 5. – Unique lightning phenomenon over Lake Maracaibo
  3. 6. – Optical phenomenon occurring shortly after sunset
  4. 8. – Emission of light by living organisms
  5. 9. – Rainbows occurring at night under moonlight
  6. 10. – Circular ice formations that appear in rivers
Down
  1. 1. – Rare and poorly understood electrical phenomenon
  2. 3. – Harmful algal blooms causing discoloration of the water
  3. 4. – Northern lights visible near the polar regions
  4. 7. – Bright spots that appear on either side of the sun