On the surface only according to QI. The huge majority of the mass of the earth is not water. The mass of the land is 40 times greater than that of the oceans.
[youtube]Grq5Yqg2xSM[/youtube]
Skip to 1:30 if you want to hear the particularly relevant bit.
[youtube]Grq5Yqg2xSM[/youtube]
Skip to 1:30 if you want to hear the particularly relevant bit.