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It comes like any other sound. Since lightning displaces a column of gas by turning it into a hot plasma, and it does so very quickly, the sound is very intense. So if the thunder does not originate on very flat land, there will be very many echos that cause it to sound like it "rolls". Even thermal gradients in the air, or density gradients made by falling rain can cause echos.

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16y ago

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Thunder is the sound caused by the rapid expansion and contraction of air surrounding a lightning bolt. When lightning strikes, it heats the air around it to temperatures hotter than the surface of the sun, causing the air to expand and contract rapidly. This rapid expansion and contraction creates shock waves that we hear as thunder.

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AnswerBot

9mo ago
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Q: How does thunder come?
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