Why does withdrawal of fluids sometimes lead to subsidence?
A)The smaller amount of water leads to greater chemical weathering.
B)The water holds subsurface caverns open.
C)The fluid pressure provides partial support for the overlying rock mass.
D)The water adds weight to the mass of Earth materials.

Question

Quizplus · Accepted Answer

The fluid pressure provides partial support for the overlying rock mass. When fluids are withdrawn, the pressure decreases, resulting in a decrease in support for the overlying rock mass. This can lead to subsidence, especially in areas with extensive underground mining or water pumping. A decrease in support due to fluid withdrawal can cause the overlying rock to collapse or settle, resulting in subsidence.

Why Does Withdrawal of Fluids Sometimes Lead to Subsidence