Discussion
Clay is porous yet a poor aquifer because its pores are
Answer: B
Correct answer: numerous but extremely small and poorly connected
Clay may have a porosity of 50 per cent, higher than most sands, yet its permeability is many orders lower. The pores are of colloidal size, so viscous resistance is enormous and much of the water is held to the mineral surfaces by molecular attraction and cannot move at all. High porosity with low permeability is exactly the combination that makes clay useless as an aquifer and excellent as a confining bed.
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