When precipitation falling on land seeps down from the surface, some of it adheres to the material it is moving through and halts its downward progress. This water is in the zone of aeration where pore spaces contain both water and air. Beneath the zone of aeration lies the zone of saturation where all pores spaces are filled with ground water. What is the surface between the zone of aeration and the underlying zone of saturation called? a. water table b. ground water c. spring d. stream