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What is the name for ancient water trapped in deep aquifers and largely disconnected from the modern rapid water cycle?

Answer and explanation

Correct answer: Fossil water

Correct answer: B, fossil water. Groundwater is stored in pores and fractures below the land surface. In some deep aquifers, the water entered the ground during a much earlier climatic period and is renewed extremely slowly, or is effectively isolated from present-day recharge. Such ancient groundwater is called fossil water. “Fossil” here describes its great age and limited connection with the current active water cycle; it does not mean that the water itself is a fossil. A is wrong because surface runoff is water moving over land soon after precipitation. C is a small amount of water held in soil pores and generally belongs to the active soil-water system. D is water tightly adsorbed as a thin film on soil particles, not ancient deep-aquifer water. Fossil water can be a valuable but non-renewable or very slowly renewable resource, so excessive pumping may deplete it. Memory cue: deep, ancient, isolated groundwater = fossil water.

Related tags

Fossil WaterGroundwaterAquiferWater CycleHydrological CycleThe Living WorldBiologyClass 11 Mcq

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