Why are over one-sixth of the world's people at risk for running out of drinking water? view available hint(s) why are over one-sixth of the world's people at risk for running out of drinking water? the world's fresh water wells are drying up. glaciers in many areas are melting. there is not enough surface water. the oceans are drying up?

The correct answer is - the world's fresh water wells are drying up. 
Even though it is estimated that there is enough fresh water for all the people on the planet, the problem is that it is very unevenly distributed across the globe, so from one side we have countries that have much more then they need, and on the other side countries that do not have enough even for basic usage. A lot of this countries are countries where deserts prevail the landscape and the fresh water reserves are way to limited, so they dry up very quickly after it's exploitation is started.

The answer is 1-plate movement along fault lines