Out of all of the water on Earth, how much is usable by humans?

1 Answer
Oct 4, 2016

Mainly ground water of about 22.5 million cubic miles in volume.

Explanation:

Unusable sea water amounts to 96.54% of the total water on, below

and above the Earth's surface. Sans inaccessible for use antarctic

and arctic ice, the usable-for-human percentage of ground water is

about 1.69%.The overall total volume is nearly 1.338 cubic billion

miles. This proportion is about 22.61 cubic million miles. If the

contributions from clouds through rain and snow are included, it

might be a little more.

It has to be noted that the source for atmospheric water is water

vapor, from surface water.

Also, the sources for ground water are these other sources. Any

way, it is give and take cycle.

.Reference: http://water.usgs.gov/edu/earthhowmuch.html