An artesian well occurs when ________
A) granite is overlain by a sandy substrate, allowing percolation into the aquifer
B) there are several aquifers that have merged
C) a water-bearing, porous layer of rock, sand, or gravel has accumulated groundwater over a long period of time
D) an aquifer is trapped under pressure between two layers that are less permeable
E) a well is dug through layers of sand and gravel into the water table
D
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Experiments cited in this chapter show that the distances away for both the Sun and the Moon are
A. closer to Earth than was thought in 1900. B. about 110 times their respective diameters. C. the same. D. impossible to say
The relative geologic time scale was largely constructed in the 20th century. Indicate whether the statement is true or false
Areas of shallow wetlands called prairie potholes were formed by what physical process?
A) Sheet erosion B) Rill erosion C) Aeolian processes D) Glacial processes
The variety of surface features on Earth results from
A) exogenic processes only. B) endogenic processes only. C) Both endogenic and exogenic processes.