earth
Sometimes the sky lights up with a bright flash and then a loud rumble follows!
Thunder is the sound made when lightning superheats surrounding air in a split second, causing it to expand explosively into a booming shockwave. Because light travels far faster than sound, you see the flash before hearing the rumble, even though both happen at once.
Rain is just water falling from clouds, not a sound caused by lightning. Wind is moving air, which can happen during a storm but isn't the rumble that follows a flash.
You can estimate a storm's distance by counting seconds between the flash and the thunder, since sound travels a predictable speed.
earth
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