What Causes Thunder and Lightning?

A SciShow Kids viewer wants to know, “Why do lightning and thunder happen?” Get your raincoat, because Jessi will take you inside a thunderstorm to give you the answer!
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SOURCES:
lightningsafety.com
http://www.ucar.edu/communications/infopack/lightning/kids.html
http://kidshealth.org/kid/talk/qa/electric_shock.html
http://www.loc.gov/rr/scitech/mysteries/thunder.html
http://www.weatherwizkids.com/weather-lightning.htm

Видео What Causes Thunder and Lightning? канала SciShow Kids