Question

lightening is always pass from sky to earth give reason

Answer 1

Lightning can occur between opposite charges within the thunderstorm cloud (intra-cloud lightning) or between opposite charges in the cloud and on the ground (cloud-to-ground lightning). ... Sometimes this is called “heat lightning” because it occurs most often in the summer.

Answer 2

hey mate here is your answer

for the clouds the Earth is the nearest neutral surface to deposit their charges and that's why generally lightning stikes go for the ground. 

I hope this helps you
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