Which statement about ground water is false?
A) It is pure H2O.
B) It is less quickly affected by pollution sources than surface water.
C) It makes up about 98 percent of Earth's unfrozen fresh water.
D) It is usually a reliable water source.
Question 2
Streams preferentially erode ________ and ________ valleys where rock is most easily eroded.
A) deep, wide
B) deep, narrow
C) shallow, wide
D) shallow, narrow
