The answer to this question would be "Creation Myths"
A creation myth is a theory or idea of how the world began and how people first came to inhabit it. An example of a creation myth would be "A large planet got hit by an asteroid, and a very large chunk of planet got caught back in the suns orbit in such a way that it started spinning around the sun, and after some time, when the earth got a moon, seas and islands started to form the planet we know today."