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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.

en.wikipedia.org/wiki/Lightning

Lightning is a sudden electrostatic discharge that occurs during a thunderstorm. This discharge .... A typical cloud to ground lightning flash culminates in the formation of an electrically conducting plasma channel through the air in excess of 5 ...

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  ...

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 ...

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 ...

www.weatherwizkids.com/weather-lightning.htm

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 a channel. Once then ...

.ask.com/youtube?q=How+Is+Lightning+Formed%3F&v=jM8h60S1GsM
Aug 25, 2009 ... How lightning forms ... Physics - How lightning occurs and how to stay safe during lightning - English - Duration: 4:26. ... How is it formed?

www.windows2universe.org/earth/Atmosphere/tstorm/lightning.html

May 27, 2010 ... The sky is filled with electric charge. In a calm sky, the positive (+) and negative (-) charges are evenly spaced throughout the atmosphere.

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

It is at that point that we see lightning and hear thunder. A bolt of lightning heats the air along its path causing it to expand rapidly. Thunder is the sound caused ...

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 ...