If you collected all of Earth's water into a sphere, how big would it…

Imagine the Earth in your mind's eye. Now round up all the water on the planet into a sphere (we're talking oceans, icecaps, atmosphere, everything — even the water bound up in you and me). How big do you think that sphere would be compared to the Earth? » 5/08/12 8:00am 5/08/12 8:00am