This sounds really stupid, but I'm trying to think of a way to make World Turtle work. And what I got after 5 minutes of careful deliberation, would be that the our earth would have to be 'flat' on the back of a giant turtle. And since I don't want mythical space turtles, I'm gonna presume that they live on a planet themselves.
Now disregarding the impracticality of there actually being a turtle who can carry the crust, the environmental changes that will happen from making the earth 'flat' and the general idiocy of this question.
If we took the crust of the Earth, made it like a giant pancake on the turtle's back, how big would the turtle[or is it tortoise?] have to be? And then how big would their planet be?
How it might look like on a smaller scale, since turtles can obviously navigate space.
What kind of tags can I even put on this?