Question

how is lightning caused in the Clouds

Answer 1

by interaction of positive terminal to negative.

Answer 2

Lightning is caused by electricity moving in between clouds or between the clouds and the ground. The electricity is formed when ice and water particles move around rapidly inside the clouds. ... The heat of the lightning causes thunder. As the hot electrical charge passes through the air, it heats up the air.


Or

Lighter, positively charged particles form at the top of the cloud. Heavier, negatively charged particles sink to the bottom of the cloud. When the positive and negative charges grow large enough, a giant spark - lightning - occurs between the two charges within the cloud.