Lightning, a form of atmospheric electromagnetism. (Image is taken from the NOAA Photo Library, NOAA Central Library; OAR/ERL/National Severe Storms Laboratory.

• 闪电，大气中的电磁现象。(图片来源:NOAA图片库，NOAA中央图书馆;OAR/ERL/国家剧烈风暴实验室。