Thunder

Thunder is the sound of the shockwave caused by lightning.

Because sound and light travel at different speeds through the atmosphere,
one can time the interval between them to tell roughly how far away the bolt
of lighting is. The speed of sound in air is approximately 340 m/s, while
the speed of light is so fast that viewing lightning occurs practically
instantaneously with the lightning strike itself, so the lightning is
approximately one kilometer distant for every 3 second interval (one mile
for 5 seconds).

Polytheistic peoples in areas with much thunder, or areas where thunder
precedes drought-breaking rain, may postulate a thunder god such as Zeus,
Jupiter or Thor.

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