The source of the thunder is a hot topic during a thunder and lightning storm. I have personally heard quite a few different answers to this question but the real answer is fairly simple. When lightning strikes, a large amount of electricity is discharged into the ground in just a fraction of a second. As the electricity moves through the air it creates high levels of heat in the air that is close around it. When air is heated it expands, and when it is heated by lightning it does it so fast that is creates the wave of pressure that we hear as thunder.
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