80% of the earth's total volume is water? Where did that fact come from?

Here is a source of facts that seem correct to me: 
http://ga.water.usgs.gov/edu/earthhowmuch.html

If all of Earth's water (oceans, icecaps and glaciers, lakes, rivers, ground 
water, and water in the atmosphere was put
into a sphere, then the diameter of that water ball would be a bit less than 
1,400 kilometers across, a bit more than
the distance between Chicago, Illinois and New Orleans, Louisiana.

About 70 percent of the Earth's surface is water-covered.


----- Original Message ----- 
From: "Nicholas Geti" <[email protected]>
To: "ProFox Email List" <[email protected]>
Sent: Monday, December 21, 2009 8:28 AM
Subject: Re: [OT] Science: Another Ice Age?


Land accounts for
only 1/7 or 14% of the total earth's surface. It is the oceans that control
all weather and planet temperatures. By total volume, the oceans account for
80% of the planet total volume, leaving the core to account for most of the
remainder. The volume of the land mass is only about 3 or 4% and cannot
affect the planet's temperature by any significant amount.


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