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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. .... A typical cloud to ground lightning flash culminates in the formation of an ...

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 ...

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 ...

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 ...

Lightning - Weather Wiz Kids weather information for kids

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 ...

Lightning Formation - Windows to the Universe

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.

www.ask.com/youtube?q=How Is Lightning Formed&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 Formed&v=4niTlOYYRYI
Apr 25, 2009 ... Up next. What is lightning made of? Why does lightning occur when clouds rub together? ... How does lightning form and how do we detect it?

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.