So we hear thunder outside as a storm passes and someone says, “God just bowled a strike!” Ever hear that saying? Did God bowl a strike? Or is thunder the cause of another weather phenomenon? Time for today’s learning session.
Thunder is caused by lightning! In a nutshell, the sudden increase in air pressure and temperature from lightning produces rapid expansion of the air surrounding and within a bolt of lightning, per Wikipedia. In turn, this expansion produces a sonic shock wave which produces the sound of thunder.
Closer the lightning is = the louder the crack of thunder.
http://en.wikipedia.org/wiki/Thunder
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