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A permeable rock layer surrounded by impermeable rocks that holds groundwater under pressure is called what?

Answer and explanation

Correct answer: Confined aquifer

Correct answer: B, a confined aquifer. An aquifer is a permeable geological layer that can store and transmit groundwater. In a confined aquifer, the permeable layer is enclosed above and below by relatively impermeable layers, so the groundwater is under pressure. If a well reaches this layer, water may rise above the top of the aquifer; where pressure is sufficient, it can flow at the surface, forming an artesian well. A, an unconfined aquifer, has a water table directly exposed to atmospheric pressure through the unsaturated zone. C is a small, local saturated zone resting above the main water table on an impermeable lens, not a regionally enclosed pressured aquifer. D is frozen surface water, not a groundwater formation. Memory cue: confined means enclosed and pressurized.

Related tags

Confined-AquiferGroundwaterPermeabilityHydrological CycleThe Living WorldBiologyClass 11 Mcq

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