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Which of Earth's feature contains most freshwater?
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The part of the surface where most of the pore spaces are filled with air is the:
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Chapter 17

Water Resources

QuestionAnswer
Which of Earth's feature contains most freshwater? Glaciers and ice sheets
The part of the surface where most of the pore spaces are filled with air is the: Unsaturated zone
Groundwater velocity (the rate of movement of groundwater) is most strongly influenced by which of the following factors? The sole (gradient) of the water table
Which of the following geologic materials usually has the highgest permeability? Loosely cemented gravel and sand
Under what conditions is it possible for a material to have both high porosity and low permeability? It is possible if the void spaces are very small or are not well connected
What statement about porosity is NOT valid? Porosity partly depends on size and shape of grains and clasts
which one is a good area to drill for a well? Permeable sands
Which one is a common setting for a spring? A limestone aquifer that intersects the surface
How does the water table look in a well after pumping? Sinking in the middle
What occurs after groundwater wells along coastlines are over pumped? Saltwater intrusion
Which is the most important source of groundwater in the El Paso area? The Hueco Bolon Aquifer
How do factories contaminate wells? Contamination runs down to the water with gravity
Which of the following are human made or human-induced substances that can contaminate groundwater? Human and agricultural waste and insecticides
Which one of the following would be most useful in investigating groundwater contamination? a map showing contours of the water table and of contamination levels
Where would you build a factory that would not contaminate underground water? At a low level so that contamination cannot run down with gravity
Where would you place a septic tank so that contamination is sent far away from the water? Place it on limestone
What is the Ogallala aquifer? It is a shallow water table aquifer surrounded by sand, silt, clay, and gravel located beneath the Great Plains
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