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Not much, really. However, it's mostly on the surface. About 71% of Earth's surface is covered in water, but in terms of total mass, it's a nearly insignificant fraction... about 0.025%.

The USGS has an interesting page showing how much water there is on Earth, if you were to collect it all into one ball, compared to the size of the Earth. It's a lot smaller than you probably think.

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13y ago

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