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Lightning is an electrical current that occurs in a thundercloud.
Small bits of ice (frozen raindrops) bump into each other as they move around in the air.
All of these collisions create an electrical charge and the whole cloud fills up with electrical charges
The positive charges form at the top of the cloud and the negative changes form at the bottom of the cloud.
A positive charge builds up beneath the cloud. The charge concentrates around anything that sticks up eg. tree
The charge coming from the cloud connects with the charge coming from the earth and ZAP the lightning strikes!