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Approximately 71 percent of the Earth's surface is water. The oceans hold 96.5 percent of that water, and there is also water in icecaps and glaciers. The air holds water vapor, and the human body...
How many percents of Earth's mass are water? I seem to remember some 3 percents, but I don't know. And how much more would it have to be to submerge all the continents including Mount Everest in the ocean?