Natural Facts: Nobody is sure what causes the sailing stones or volcanic lightning. Also, the glowing waves are causes by phytoplankton, and the fire rainbows are made from ice crystals instead of water droplets.
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Several lightning strokes over the course of a thunderstorm near Norman, Oklahoma in Photo by C. Clark used with kind permission from the NOAA Photo Library, NOAA Central Library, OAR/ERL/National Severe Storms Laboratory.