An aquifer bounded above and below by impermeable layers of rock and clay is called a(n)
A) spring.
B) unconfined aquifer.
C) confined aquifer.
D) water table.
E) artesian well.
Question 2If one were to map a vertical profile of groundwater resources, which of the following is correct order from top to bottom of an unconfined aquifer?
A) zone of aeration--water table--zone of saturation--impermeable rock
B) zone of saturation--water table--zone of aeration--impermeable rock
C) zone of aeration--zone of saturation--water table--impermeable rock
D) water table--zone of aeration--zone of saturation--impermeable rock
E) impermeable rock--zone of aeration--water table--zone of saturation
Question 3A subsurface rock layer that is permeable to groundwater flow is called a(n)
A) zone of aeration.
B) aquiclude.
C) aquifer.
D) water table.
E) spring.
Question 4Excess surface water percolates through the zone of ________ to reach the water table and the zone of ________.
A) aeration; saturation
B) hydration; infiltration
C) porosity; permeability
D) dehydration; hydration
E) infiltration; porosity
Question 5Groundwater 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 6What 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
Question 7The largest practical potential source of fresh water in the world is
A) soil moisture.
B) lakes.
C) groundwater.
D) stream discharge.
E) ice sheets and glaciers.
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