Why Do Creeper Explode In Minecraft?

Answer 1

Creepers explode because they are made out of tnt and when you agrivate them, the cause the tnt to "ignite". When the creeper gets agrivated they then explode and resultly kill them selves from the explosion. The damage creepers do are usually depending on the distance you are from the creeper. I hope i helped! :D

Answer 2

Creepers explode because they are essentially made of gunpowder, and when they get close to you they activate the gunpowder to try to kill you.