Genesis...
Once upon the time before time, God said "Let there be light!"
Before his outstretched hand, a burst of white appeared and light was born. Then, God divided the light from the darkness and called them 'Day', and 'Night'.
The next "Day", God got the idea to make water, but first, he needed something to put the water in. He took his hands and got a piece of the light, shaping it and forming it until it was spherical. He added heavy streaks of gray to form the clouds. As the clouds collected, a massive rain occurred that continued for a very, very, very long time. Thus the seas or "sea" as it would have been called, was formed. As a result of the gigantic expanse of blue, the top half of the sphere (which was still light) reflected the sea, and became blue. To keep things that did not belong inside of the sphere out, a thin barrier was created between it and the surrounding space, the atmosphere.