quiz 11 geol
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| Permeable rock strata or sediment that transmit groundwater freely are called ________. | aquifers
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| ________ would have the largest capacity to naturally remove sewage pollutants | slightly clayey sand
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| When water is pumped from a well, a depression is often produced in the water table. Such a depression is a(n) _______ | cone of depression
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| Which one of the following concerning artesian wells is NOT true | When the well penetrates the aquifer, the water rises to the bottom of the aquitard above the aquifer.
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| Which of the following is associated with areas of karst topography? sinkholes - soluble rock - caverns | all of these
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| A ________ is the icicle-like speleothem that grows down from the roof of a cavern | stalactite
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| ________ is the volume of voids or open space in a rock or unconsolidated material. | Porosity
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| The water table is ________. | a boundary between saturated rock below and unsaturated rock above
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| An artesian well is one in which ________. | water rises above the top of the aquifer without any pumping
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| The term karst topography was first used in ________. | the Republic of Slovenia, a province of the former Yugoslavia
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| Hot springs are most numerous in which region of the United States | West
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| Which of the following best describes how geysers erupt? | 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
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| Caves most commonly form in ________ | limestone
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| Porosity is a measure of the volume of open space in rocks and unconsolidated geological materials such as alluvium and soils | T
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| As its name implies, the water table is always very level (flat). | F
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| Most caves and caverns originate by solution of limestone | T
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| For a well to be characterized as being artesian, water must flow freely at the surface | F
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| Most hot springs in the United States are located in the southeast, especially Georgia | F
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| The formation of stalactites and stalagmites occurs in the zone of saturation | F
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| Lowering of the water table around a pumping well results in a cone of infiltration | F
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| One environmental problem associated with groundwater is land subsidence caused by withdrawal | T
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| Karst topography is most commonly associated with areas underlain by massive sandstone strata. | F
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| The source of heat for most hot springs is hot igneous material beneath the surface | T
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| Sinkholes are actively forming in portions of the southeastern United States | T
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