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