At the time the Bible was written, people thought the world was flat and held up by three elephants. When someone asked what held the world up the answer was "three elephants." When someone asked what held up the elephants the answer was "a huge tortoise." No one ever thought to ask what held up the tortoise.
Did you know that long ago the Bible told us what the earth hangs upon, before it was proven scientifically? "He stretches out the north over empty space, and hangs the earth upon nothing." (Job. 26.7)
Did you also know the Bible tell us the earth is a sphere, long before it was discovered scientifically? "Have you not known? Have you not heard?…Have you not understood from the foundations of the earth? It is He who sits above the circle of the earth." (Isa. 40:21-22). The word "circle" in Hebrew is also translated "sphere."
Job and Isaiah were probably called fools for saying the earth is a sphere that hangs upon nothing because many people at that time believed otherwise. Time proved them correct.