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Explain how lightning takes place?
 
During rain or thunderstorm,  move upwards while the  move downwards.

In this process, charges  separated. The  accumulate near the upper edges of clouds, and the accumulate near the lower edges of clouds.
 
There is an accumulation of  on the ground also.
 
Air is present between the clouds and the ground. Generally, the air is a  of charges. When the air  its resistance, it  to conduct the charges.
 
Negative and positive charges , producing streaks of bright light and sound. We see streaks as lightning, and this process is known as electric discharge.
The process of electric discharge can occur between clouds and the earth's surface or even between two clouds.