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Lightning results from the buildup and discharge of electrical energy between positively and negatively charged areas.
Rising and descending air within a thunderstorm separates these positive and negative charges.

Lightning - Wikipedia

en.wikipedia.org/wiki/Lightning

Lightning is a sudden electrostatic discharge that occurs during an electrical storm. .... Lightning is usually produced by cumulonimbus clouds, which have bases that are typically 1–2 km (0.6...

What is lightning? - science made simple

www.sciencemadesimple.co.uk/activity-blogs/lightning

May 23, 2012 ... How is lightning formed? Water and ice move around inside the cloud; forced up by warm air currents, down by gravity, and compressed in the ...

NWS JetStream - How Lightning is Created

www.srh.noaa.gov/jetstream/lightning/lightning.html

The conditions needed to produce lightning have been known for some time. However, exactly how lightning forms has never been verified so there is room for  ...

NASA - How Is Lightning Made?

www.nasa.gov/audience/forstudents/k-4/home/F_What_Causes_Lightning_Flash.html

Dec 9, 2007 ... He wanted to prove that lightning is a form of electricity. We know now that flying a kite in a storm is not safe. But, Ben was right. Lightning is a ...

Lightning - Weather Wiz Kids weather information for kids

www.weatherwizkids.com/weather-lightning.htm

Lightning is a bright flash of electricity produced by a thunderstorm. ... If you hear the sound of thunder, then you are in danger from lightning. Lightning kills and ...

What causes lightning? - Planet Science

www.planet-science.com/categories/over-11s/natural-world/2012/06/what-causes-lightning.aspx

Have you ever got a static electricity shock? Or seen sparks when you take off your jumper? When lightning is made the same thing happens, but on a much ...

www.ask.com/youtube?q=How Is Lightning Created?&v=jM8h60S1GsM
Aug 25, 2009 ... How lightning forms. Rob Mayeda ... Why does lightning occur when clouds rub together? What causes thunder ... How is it formed? - Duration: ...
www.ask.com/youtube?q=How Is Lightning Created?&v=4niTlOYYRYI
Apr 25, 2009 ... What is lightning made of? Why does lightning occur when clouds rub together? What causes thunder ... When Lightning Strikes Your Airplane.

How Lightning Forms | UCAR Center for Science Education

scied.ucar.edu/webweather/thunderstorms/how-lightning-forms

Lightning happens when the negative charges (electrons) in the bottom of the cloud are attracted to the ... Thunder is the sound caused by rapidly expanding air.