Question

What are the reasons of lightning thunder?

Answer 1

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Answer 2

There are two scientifically proved reasons of lightning thunder.  

1. When a stream of electrons flows between/within the clouds or between clouds and the ground, lightning occurs and thus causes thunder.  
2. When a stream of clouds or the lightning bolt passes from cloud to ground, a channel of air opening occurs as a hole. When light passes through the hole, the air gets collapsed creating big sound wave is called as thunder. Thus lightning thunder occurs.