Why do rivers usually have some water in them, even during a drought? a. there is always some runoff. b. rivers cut into saturated ground. c. rivers cut into unsaturated ground. d. there is always some water above the water table.

Rivers cut into saturated ground meaning that some rivers have a source of water

You not be doing this in a quiz. if you actually studied your work you would know the answer. the answer though is that they would use gdp per capita because it measures a smaller portion (person). this could show individual growth per person in the country.