Lightning, while beautiful to look at, can be deadly and occurs every day in various parts of the world. Lightning is an electrical discharge caused by an imbalance between storm clouds and the ground.
What kind of imbalance exactly? Well, when the ground is hot, it heats the air above it. Warm air rises and, as it rises, water vapor cools and forms a cloud. When the air continues to rise, the cloud increases in size. At the top of the clouds, the temperature is below freezing, and the water vapor turns to ice. As these ice pieces knock against each other, the collisions cause a build up of electricity.
Soon, the cloud is filled with electric charges, which eventually cause a spark or lightning. Much of the time lighting stays within the clouds, but sometimes, it strikes down. And this is where it can become deadly.