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Lightning is caused when two charged bodies come in contact and they break the insulation of air and hence electrons flow from one body to other and it accompanies sparking which further lead to lightning.
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Lightning is an electric current. Within a thundercloud way up in the sky, many small bits of ice (frozen raindrops) bump into each other as they move around in the air. All of those collisions create an electric charge. After a while, the whole cloud fills up with electrical charges.
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