After the sun set , a dazzling display of rare psychedelic clouds lit up the twilight sky over northern Scotland. These were mother-of-pearl, or nacreous clouds, and shimmered with an electric glow in the dark.
How Do Clouds Form? - Cloud Ingredients and Formation
Earthquake clouds form in seconds – between seconds (this is important as there are similar looking cloud formations but they form slowly) The patterns of the clouds are the direct result of physical subterranean faults .