lightning causes thunder. lightning happens instantaneously, but thunder (at a distance) sounds like it’s coming, then it claps, then fades away. this don’t make no damn sense given that light and sound move at fixed rates.
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A lightening bolt is an extended object which may be multiple miles (or km) long. So the sound from the nearer part will get there before the sound from the farthest away part. So that’s why thunder can be more than just one crack.
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