GEO: CHAPTER 17 question well answered graded A+ 2023/2024

GEO: CHAPTER 17Which of the following characteristics are found in all good aquifers? - correct answer High porosity and high permeability Which of the following accounts for the largest usage of groundwater in the United States? - correct answer Agriculture and irrigation An artesian well is one in which... - correct answer Water rises above the top of the aquifer without any pumping A ________ is the icicle-like speleothem that grows down from the roof of a cavern. - correct answer Stalactite Contamination of wells by saltwater intrusion is commonly a problem in _______________ - correct answer Coastal areas After ice sheets and glaciers, which of the following reservoirs contain(s) the next highest percentage of the Earth's freshwater? - correct answer Groundwater Which of the following statements best describes how geysers erupt? - correct 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. An aquifer is... - correct answer A saturated, porous, and permeable layer or stratum In areas underlain by unconsolidated or weakly consolidated strata, lowering of the water table can cause the land to subside. - correct answer True Which of the following statements logically explains why parts of some cavern systems are aerated? - correct answer A nearby, downcutting stream lowered the water table after the caves had formed. Excessive groundwater withdrawal can lead to which of the following results? - correct answer The water table drops or declines in elevation. For unconfined aquifers, what hydrologic factor is approximated by the slope of the water table? - correct answer Hydraulic gradient Which of the following statements regarding the mapping of the water table is INCORRECT? - correct answer Groundwater flow lines parallel the water-table contour lines Water infiltrates down to the water table from influent streams. - correct answer True Which of the following statements is INCORRECT with regard to the water table? - correct answer The level of the water table never changes regardless of the time of year A perched water table develops when... - correct answer A horizontal aquitard above the regional water table prevents downward-percolating water from reaching the main aquifer. Downward percolating water accumulates above the aquitard to form a secondary zone of saturation above the main water table. What is the relationship between drawdown and the cone of depression associated with a pumping well? - correct answer Drawdown is the distance between the original water table and the water level in the well. Which of the following rock types would have the largest capacity to naturally remove sewage pollutants? - correct answer Slightly clayey sand The water table is... - correct answer A boundary between saturated rock below and unsaturated rock above The common, rock-forming mineral __________, which comprises the rock _______________, most readily dissolves in slightly-acidic groundwater? - correct answer Calcite / limestone