The boundary between the aerated, or vadose, zone above and the saturated zone below
question
Which of the following statements concerning unconfined aquifers on barrier islands and atolls is correct?
answer
Any salt water in the aquifer will rise if the water table is lowered by pumping.
question
What is the relationship between drawdown and the cone of depression associated with a pumping well?
answer
Drawdown is the distance between the original water table and the water level in the well
question
Name two characteristics found in all aquifers.
answer
High porosity and high permeability
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Which of the following best describes how geysers erupt?
answer
With a slight reduction in pressure, water in a saturated, natural conduit suddenly boils, sending a plume of steam and hot water into the air above the vent.
question
Which of the following describes a disappearing (sinking) creek?
answer
An influent stream in a karst area
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Which of the following describes the water table?
answer
The boundary between saturated rock below and unsaturated rock above
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Which of the following describes the configuration of an unconfined water table around a pumping well?
answer
Cone of depression
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Which of the following defines an aquifer?
answer
A saturated, porous, and permeable layer or stratum
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Which of the following materials would have the best capability to naturally remove sewage pollutants?
answer
Slightly clayey sand
question
When will a perched water table develop?
answer
When a horizontal aquitard above the regional water table lies below an aquifer
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What can be a result of excessive groundwater withdrawal?
answer
The water table may drop or decline in elevation
question
The hot spring deposits at Mammoth Hot Springs, Yellowstone National Park, are travertine. What rock probably lies somewhere beneath the hot springs?
answer
Limestone
question
What force pushes groundwater from pore to pore below the water table?
answer
Pressure gradient or hydraulic gradient
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Which common rock-forming mineral or mineral group is most readily dissolved by groundwater?
answer
Calcite
question
What term describes the volume of voids or open spaces in a rock or unconsolidated material?
answer
Porosity
question
What is the name of an icicle-like speleothem that grows down from the roof of a cavern?
answer
Stalactite
question
What characteristic of rocks and/or soil controls the ease (or difficulty) of groundwater transmission?
answer
Permeability
question
Which of the following describes an artesian well?
answer
A well in which water rises above the top of the aquifer without any pumping
question
What reservoir(s) contain(s) the next-highest percentage of Earth's freshwater after ice sheets and glaciers?
answer
Groundwater
question
Which of the following materials would have the best capability to naturally remove sewage pollutants
answer
Slightly clayey sand
question
Which of the following statements defines the aerated, or vadose, zone?
answer
The aerated, or vadose, zone lies above the water table
question
Which of the following are specific features of karst topography?
answer
Streams flow into depressions called sinkholes and continue to flow underground
question
What force pushes groundwater from pore to pore below the water table?
answer
Pressure gradient or hydraulic gradient
question
When will a perched water table develop?
answer
When a horizontal aquitard above the regional water table lies below an aquifer
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