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Thunder forms when lightning superheats the air around it, causing rapid expansion that creates a sound wave.

Thunder - Wikipedia

en.wikipedia.org/wiki/Thunder

The cause of thunder has been the subject of centuries of speculation and scientific inquiry. The first recorded theory is attributed to the ...

What causes thunder? - Scientific American

www.scientificamerican.com/article/what-causes-thunder/

Jan 17, 2000 ... Richard Brill, a professor at Honolulu Community College, explains: Thunder is caused by lightning, which is essentially a stream of electrons ...

What causes the sound of thunder? Everyday Mysteries:Fun Science

www.loc.gov/rr/scitech/mysteries/thunder.html

Thunder is caused by the rapid expansion of the air surrounding the path of a ... The loud thunder that follows the lightning bolt is commonly said to come from ...

NOAA/NASA SciJinks :: What causes lightning and thunder?

scijinks.jpl.nasa.gov/lightning/

Lightning! Zap! You just touched a metal doorknob after shuffling your rubber- soled feet across the carpet. Yipes! You've been struck by lightning! Well, not really ...

What is Thunder? - science made simple

www.sciencemadesimple.co.uk/curriculum-blogs/primary-blogs/thunder

May 23, 2012 ... What causes thunder? Which is quicker - thunder or lightning? Test thunder and lightning speed yourself! Read our blog all about thunder!

www.ask.com/youtube?q=What Causes Thunder?&v=0RpNuXP7XBw
Dec 30, 2008 ... Thunderstorm and Rain Sounds - Heavy Thunder & lightning Strike Ambience For ... Mr. Rain and Thunder - relaxing sounds 9,106,038 views.
www.ask.com/youtube?q=What Causes Thunder?&v=fEiVi9TB_RQ
Jun 18, 2015 ... A SciShow Kids viewer wants to know, “Why do lightning and thunder happen?” Get your raincoat, because Jessi will take you inside a ...

What causes thunder?

www.weatherquestions.com/What_causes_thunder.htm

Jun 1, 2012 ... Brief, simplified description of the processes that cause thunder.

Lightning - Weather Wiz Kids weather information for kids

www.weatherwizkids.com/weather-lightning.htm

What causes thunder? Thunder is caused by lightning. When a lightning bolt travels from the cloud to the ground it actually opens up a little hole in the air, called ...