Geoscience:Water: From the Earth for You
Presently 44% of Americans get their drinking water from groundwater sources， and about 56% of Americans get their drinking water from surface water sources. Over the last 200 years， the earth population has dramatically increased， but the world water supply remained about the same. It hasn’t increased with the population. In this program， we shall look for the reasons why water is so important to human beings and why we shouldn’t take water for granted.
- Added：2006
- Country：America
- Duration：20
- Time of update：2011/8/17 11:36:40