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: Lightning is caused by the buildup of static electricity within clouds. When the electrical difference between the cloud and the ground (or another cloud) becomes too great, a massive spark—lightning—breaks through the air to balance the charge. Types of Lightning Cloud-to-Ground (CG) : The most dangerous type that strikes the earth. Intra-Cloud (IC) : Common "sheet lightning" that stays within the clouds. Spider Lightning

: Ensure your text is aligned properly. If you are writing by hand, keep your lines parallel to the top and bottom edges of the page. Final Review xem hinh set