When a tree is struck by lightning, the moisture inside is instantly turned to steam. This creates enormous pressure which can cause the tree to burst apart like a firecracker.
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phranksphotos365 
Mar 13, 2012 @ 20:32:55
Wow. I didn’t realize that the trees can explode when struck by lightning, but it makes sense now that I think about it. Glad to learn something new! Thanks!