If you took all the surface water and sucked it all up into a ball, it would look like this.
Now... there is more water UNDER the ground than there is ABOVE.
If you represented Earth with an APPLE, the skin of the apple is thicker than the CRUST of the Earth. The same amount off water on the surface would be represented by washing the apple of under the faucet, just before wiping it off.
Wow!