Gly Test 3 Practice Ch 17

37 Questions | Attempts: 53
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  • 1/37 Questions

    The water table is ________.

    • A boundary between unsaturated bedrock and an underground river
    • A boundary between unsaturated bedrock below and saturated bedrock above
    • An underground mass of partly saturated rock
    • A boundary between saturated rock below and unsaturated rock above
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  • 2. 

    _______ controls the ease (or difficulty) of groundwater transmission through a porous  material.

    • Potability

    • Portability

    • Permeosity

    • Permeability

    Correct Answer
    A. Permeability
  • 3. 

    ________ is the volume of voids or open space in a rock or unconsolidated material.

    • Permeability

    • Space yield

    • Porosity

    • Saturation index

    Correct Answer
    A. Porosity
  • 4. 

    ________ account for the largest usage of groundwater in the United States.

    • Water for livestock and poultry

    • Domestic and municipal supplies

    • Industrial uses

    • Agriculture and irrigation

    Correct Answer
    A. Agriculture and irrigation
  • 5. 

    An unconfined water table is the ________.

    • Boundary between the saturated zone above and partly saturated zone below

    • Bottom boundary surface of the saturated zone above an aquitard

    • Boundary between the aerated zone above and saturated zone below

    • Boundary between the aerated and unsaturated zones

    Correct Answer
    A. Boundary between the aerated zone above and saturated zone below
  • 6. 

    What is the relationship between drawdown and the cone of depression associated with a  pumping well?

    • The drawdown is the diameter of the cone of depression measured at the elevation of the original water table.

    • The drawdown is the percentage of available water in the aquifer that has already been used.

    • Drawdown is the distance between the original water table and the water level in the well.

    • There is no relationship between drawdown and the cone of depression.

    Correct Answer
    A. Drawdown is the distance between the original water table and the water level in the well.
  • 7. 

    For unconfined aquifers, what hydrologic factor is approximated by the slope of the water  table?

    • Porosity head

    • Hydro competency

    • Affluent decline

    • Hydraulic gradient

    Correct Answer
    A. Hydraulic gradient
  • 8. 

    _______ are characteristics found in all good aquifers.

    • High porosity and high permeability

    • Low permeability and high potability

    • High potability and high portability

    • Low porosity and low permeability

    Correct Answer
    A. High porosity and high permeability
  • 9. 

    An artesian well is one in which ________.

    • The water is warm, fairly saline, and recharged by an affluent stream

    • Pressurized groundwater rises from a deep, unsaturated aquifer

    • Water rises above the top of the aquifer without any pumping

    • The well is horizontal and the water table is perched

    Correct Answer
    A. Water rises above the top of the aquifer without any pumping
  • 10. 

    A ________ is the icicle-like speleothem that grows down from the roof of a cavern.

    • Stalandite

    • Stalactite

    • Stalagmite

    • Slagdite

    Correct Answer
    A. Stalactite
  • 11. 

    The hot spring deposits at Mammoth Hot Springs, Yellowstone National Park, are travertine.  What rock probably lies somewhere beneath the hot springs?

    • Shale

    • Rhyolite

    • Limestone

    • Quartzite

    Correct Answer
    A. Limestone
  • 12. 

    Which one of the following situations result from excessive withdrawl of groundwater in a  given area?

    • Unconsolidated medium-grained sand; sand grains are coated with clay minerals

    • Sandstone; well-cemented with a few, widely spaced vertical fractures

    • Lakebeds; unconsolidated very fine-grained sand and silt

    • Limestone; numerous solution channels and fractures widened by dissolution

    Correct Answer
    A. Limestone; numerous solution channels and fractures widened by dissolution
  • 13. 

    What force pushes groundwater from pore to pore below the water table?

    • Integrated saturation impulse

    • Permeability steepness

    • Pressure gradient or hydraulic gradient

    • Seepage affluence actor

    Correct Answer
    A. Pressure gradient or hydraulic gradient
  • 14. 

    After ice sheets and glaciers, ________ contain(s) the next highest percentage of the Earth's  freshwater.

    • The atmosphere

    • Lakes and rivers

    • Groundwater

    • Rocks & minerals

    Correct Answer
    A. Groundwater
  • 15. 

    Which common, rock-forming mineral or mineral group is most readily dissolved by  groundwater?

    • Calcite

    • Quartz

    • Feldspars

    • Clay minerals

    Correct Answer
    A. Calcite
  • 16. 

    A stream is said to be perennial and effluent when ________.

    • The channel is above the local water table year round

    • The local water table is above the channel bottom year round

    • The channel bottom and the water table are constantly at the exact same level

    • Precipitation is such that the water table remains constant throughout the year

    Correct Answer
    A. The local water table is above the channel bottom year round
  • 17. 

    A perched water table develops when ________.

    • A horizontal aquitard above the regional water table lies below an aquifer

    • An aquifer above the regional water table is overlain by a horizontal aquitard

    • An aquifer below the regional water table is underlain by a horizontal aquitard

    • An aquitard below the regional water table lies above a horizontal aquifer D) a

    Correct Answer
    A. A horizontal aquitard above the regional water table lies below an aquifer
  • 18. 

    ________ would have the largest capacity to naturally remove sewage pollutants

    • Fractured granite

    • Well-sorted, coarse gravel

    • Slightly clayey sand

    • Limestone with solution channels and caverns

    Correct Answer
    A. Slightly clayey sand
  • 19. 

    Which one of the following is not a speleothem?

    • Geyserite

    • Dripstone

    • Stalactite

    • Stalagmite

    Correct Answer
    A. Geyserite
  • 20. 

    Which of the following best describes how geysers erupt?

    • Water suddenly boils in disconnected voids and cracks above the water table, causing the aquifer to explosively fragment.

    • Water slowly boils in a network of vertical cracks above the water table, sending up a plume of steam and hot water.

    • Water below the water table slowly boils in a vertical crack or natural conduit, causing a plume of condensed water vapor to rise above the vent.

    • 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.

    Correct Answer
    A. 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.
  • 21. 

    Where are the most extensive geothermal features in the world?

    • Yosemite National Park, U. S.

    • Geysers Artesian Park, Japan

    • Iceland's Groundwater Preserve

    • Yellowstone National Park, U. S.

    Correct Answer
    A. Yellowstone National Park, U. S.
  • 22. 

    How would hazardous substances behave that accidentally entered a groundwater system?

    • Gasoline and kerosene would float on the watertable; ethyl alcohol would dissolve and disperse in the groundwater.

    • Gasoline and kerosene would float on the water table, but most pesticides break down chemically when they reach the water table.

    • Sulfuric and nitric acids would sink to the bottom of the aquifer; kerosene would accumulate as a layer just below the water table.

    • All of the above hazardous substances would dissolve into the groundwater.

    Correct Answer
    A. Gasoline and kerosene would float on the watertable; ethyl alcohol would dissolve and disperse in the groundwater.
  • 23. 

    A lens of fresh groundwater in an unconfined aquifer overlies deeper, salty groundwater. If the  water table elevation drops by one foot, how far will the interface between the freshwater and salty  water rise?

    • 10 feet

    • 30 meters

    • 20 meters

    • 40 feet

    Correct Answer
    A. 40 feet
  • 24. 

    The term karst topography was first used in ________.

    • The Republic of Slovenia, a province of the former Yugoslavia

    • Eastern Canada in areas of fractured igneous and metamorphic rocks

    • India near the southern foothills of the Himalayan Mountains

    • Australia for the extremely dry interior area near Ayres Rock and Alice Springs

    Correct Answer
    A. The Republic of Slovenia, a province of the former Yugoslavia
  • 25. 

    Which ofthe following is not a general characteristic of groundwater?

    • Constant temperature year round

    • Rarely contains dissolved constituents

    • Rarely contains suspended sediment

    • Supply is independent of short droughts

    Correct Answer
    A. Rarely contains dissolved constituents
  • 26. 

    Excessive groundwater withdrawals can cause ________.

    • The water table to drop or decline in elevation

    • An influent stream to become an effluent stream

    • Expansion of the dewatered aquifer

    • Porosity in the aquifer to increase as the water is removed

    Correct Answer
    A. The water table to drop or decline in elevation
  • 27. 

    The aerated zone ________.

    • Lies above the water table

    • Pore spaces are filled with water

    • Is a well-oxygenated, shallow aquifer

    • Lies below the capillary fringe zone

    Correct Answer
    A. Lies above the water table
  • 28. 

    An aquifer is ________.

    • The porous and permeable, saturated cone of depression in an aquitard

    • A layer or stratum in which groundwater flows downward to the water table

    • A saturated, porous, and permeable layer or stratum

    • An unsaturated, influent-flow bed or stratum below a spring

    Correct Answer
    A. A saturated, porous, and permeable layer or stratum
  • 29. 

    Which of the following describes the configuration of an unconfined water table around a  pumping well?

    • Depressional withdrawal

    • Upside-down siphon

    • Cone of depression

    • Inverted cone head

    Correct Answer
    A. Cone of depression
  • 30. 

    A disappearing (sinking) creek is ________.

    • An influent stream in a karst area

    • A stream that downcuts below the water table

    • A creek that originates as a large spring flowing from a cave

    • A small creek flowing downslope to the top of a perched water table

    Correct Answer
    A. An influent stream in a karst area
  • 31. 

    Which one of the following concerning stalactites and stalagmites is not true?

    • Stalactites are deposited from water dripping from the ceiling of an aerated cavern.

    • Both are composed of calcium carbonate.

    • Both are forms of dripstone; stalactites hang from the ceiling, stalagmites grow upward from the cavern floor.

    • Stalagmites form on the floors of caves below the water table.

    Correct Answer
    A. Stalagmites form on the floors of caves below the water table.
  • 32. 

    Which one of the following logically explains why parts of some cavern systems are aerated?

    • The caves formed and later the water table rose.

    • A nearby, downcutting stream lowered the water table after the caves had formed.

    • Streams formerly flowing on the surface were diverted into the groundwater system through sinkholes.

    • The main water table is perched above the cavern roofs, allowing air to enter.

    Correct Answer
    A. A nearby, downcutting stream lowered the water table after the caves had formed.
  • 33. 

    Which one of the following concerning artesian wells is not true?

    • The well penetrates an aquifer overlain by an aquitard.

    • The well penetrates an aquifer underlain by an impermeable bed.

    • The aquifer is generally inclined, and it is saturated to an elevation above the point where the well penetrates the aquifer.

    • When the well penetrates the aquifer, the water rises to the bottom of the aquitard above the aquifer.

    Correct Answer
    A. When the well penetrates the aquifer, the water rises to the bottom of the aquitard above the aquifer.
  • 34. 

    Which of the following statements concerning unconfined aquifers on barrier islands and atolls  is correct?

    • Wells drilled below sea level will produce only saline water.

    • The water table must be 40 feet above sea level to keep the salty water in the aquifer below sea level.

    • Any salty water in the aquifer will rise if the water table is lowered by pumping.

    • Pumping freshwater from one, large capacity well is much less likely to cause salty water to rise in the aquifer than pumping from several, widely spaced, smaller capacity wells.

    Correct Answer
    A. Any salty water in the aquifer will rise if the water table is lowered by pumping.
  • 35. 

     ________ are specific features of karst topography.

    • Streams flowing into depressions and continuing underground

    • Perched water table springs on hillsides

    • Numerous artesian wells in a given area

    • Perennial, influent streams fed by large springs

    Correct Answer
    A. Streams flowing into depressions and continuing underground
  • 36. 

    Which of the following can logically be concluded by speleothems/dripstone hanging from a  cave roof?

    • The cave roof was below the water table when the speleothems formed.

    • The cave floor was above the water table and the roof was below the water table when the speleothems formed.

    • The cave roof was above the water table when the speleothems formed.

    • The cave roof was below the water table sometime after the speleothems had formed.

    Correct Answer
    A. The cave roof was above the water table when the speleothems formed.
  • 37. 

    Which one of the following statements is true for an artesian aquifer?

    • The water table in the recharge area is at a higher elevation than the top of the aquifer in the subsurface.

    • Upward flow from a permeable aquitard is prevented by a confining aquifer.

    • The pressure at any point in the aquifer is considerably less than the weight of the water column between the point and the top of the aquifer.

    • In deep, stream-cut valleys, many springs are fed from artesian aquifers.

    Correct Answer
    A. The water table in the recharge area is at a higher elevation than the top of the aquifer in the subsurface.

Quiz Review Timeline (Updated): Mar 21, 2022 +

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  • Current Version
  • Mar 21, 2022
    Quiz Edited by
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  • Apr 10, 2013
    Quiz Created by
    Elfernagomez
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