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[u]First off, here is our gathered data:[/u]

[i]The volume of the water in all of Earth's oceans totals approximately 3.612 x 10^20 gallons.
This is, about: 361,200,000,000,000,000,000 gallons.

One pound of salt water weighs about 8.5 pounds.[/i]

So, with this information, we can calculate the approximate weight of all the ocean's water on the Earth;
[b]which is approximately 3.0702 ? 10^21 lbs.
[i]This is, about: 3,070,200,000,000,000,000,000 pounds[/i][/b].

The ammount of water on our Earth is amazing and overwhelming. Our massive and powerful oceans cover approximately 361 million sq. km of the surface of the whole earth, which is an amazing 71% of the earth's surface; almost three fourths of it. These numbers are definitely close, however they are not the exact measurements. Not all salt water weighs the same, due to its different saline measurements in parts-per-square-inch (ppi), which makes the weight differ in different parts of the world. On average, though, these numbers do suffice.


http://wiki.answers.com/Q/How_much_does_one_gallon_of_salt_water_weigh
http://www.princeton.edu/~tprep/tsm/scienceaction/gallons.htm
http://en.wikipedia.org/wiki/Oceans