Lightning Strike.

Originally shared by Andres M. Trianon

Lightning Strike.

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Trees are frequent conductors of lightning to the ground.[10] Since sap is a relatively poor conductor, its electrical resistance causes it to be heated explosively into steam, which blows off the bark outside the lightning’s path. In following seasons trees overgrow the damaged area and may cover it completely, leaving only a vertical scar. If the damage is severe, the tree may not be able to recover, and decay sets in, eventually killing the tree

http://en.wikipedia.org/wiki/Lightning_strike

http://img0.joyreactor.com/pics/post/lightning-strike-tree-gif-1203193.gif