You see, a long time ago, the Earth was flat, but the elephants didn't like that. They stood on the very edges of the flat planet to curve them around the turtle's shell, but that left the turtle feeling uncomfortable, so he kicked Earth off his back and in the sky. The elephants couldn't move off the edges of the planet fast enough to stop it from becoming round and so the planet joined togeth, making Africa one continent. Some of the faster elephants made it into Asia before this happened though, and that is why the world is round.
How does gravity work?