​When a thunderstorm happens, you will see flashes of lightning and hear loud claps of thunder. Do you know how lightning happens? Let me tell you about it. Based on the research, ice particles cause lightning in the cloud. The ice particles grind together. Consequently, an electric charge forms at the bottom of the cloud. An opposite charge builds upon the ground right below the cloud. Little streamers come down from the cloud and up from the ground. When two of the streamers meet, a current of electricity happens and we have lightning.

(Source: Kristine Teo, Primary English Cloze Passages 4,2002, Singapore, Postkid.com Pte Ltd)

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