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Geography

Which mechanism initiates surface subsidence after rapid groundwater extraction in coastal aquifers?

A)Glacio-isostatic crustal rebound
B)Consolidation of aquifer sediments
C)Thermal contraction of bedrock
D)Erosion of unsaturated zone layers

💡 Explanation

When water is rapidly extracted, the pore pressure decreases, causing increased effective stress on the aquifer matrix and volume reduction through inelastic compaction via consolidation. Therefore, sediment consolidation results, rather than rebound, contraction or erosion, which involve different geological properties or processes.

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