Groundwater begins as
A) soil moisture.
B) outgas materials from Earth's crust.
C) surplus water that percolates downward below the surface.
D) lakes that are slowly buried by impermeable materials.
E) stream discharge.
Question 2
What percentage of the U.S. population derives a portion of its freshwater from groundwater resources?
A) 5 percent B) 15 percent C) 25 percent D) 50 percent E) 75 percent
