Environmental

Land subsidence in the Houston area is primarily caused by:

ASeismic activity along fault lines
BHistorical over-pumping of groundwater causing the land surface to sink✓ Correct
CSalt dome dissolution
DUrban heat island effects

Explanation

Significant land subsidence in the Houston-Galveston area has historically been caused by excessive groundwater withdrawal. The Harris-Galveston Subsidence District was created to manage groundwater pumping and reduce further subsidence.

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