How much of planet Earth is made if Water? Very little actually.
For if all of the water on or near the surface of the Earth were bunched up into a ball. The radius of this ball would be only about 700 kilometers, less than half the radius of the Earth's Moon.
I find the picture below, visually astounding.

http://apod.nasa.gov/apod/ap120515.html

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"You will never find a real Human being - Even in a mirror." ....Mike Kremer.