3 March 2015
Researchers have proposed a mechanism for the generation of glass spherules in geologic deposits through the occurrence of volcanic lightning. The existence of fulgurites — glassy products formed in rocks and sediments struck by cloud-to-ground lightning — provide direct evidence that geologic materials can be melted via natural lightning occurrence.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/_PoXcZwJ6FM/150303183409.htm
