Here's a breakdown:

* Subsidence refers to the sinking or settling of the ground surface. It can occur over large areas or smaller localized zones.

Causes of Subsidence:

* Groundwater withdrawal: When groundwater is pumped out faster than it can be replenished, the water pressure supporting the ground can decrease, leading to compaction of soil and subsidence.

* Mining: Removing underground resources like coal, oil, or minerals can create voids that can collapse, causing the ground to sink.

* Natural compaction: Over time, sediments can compact due to weight from overlying layers, resulting in subsidence.

* Earthquakes: Earthquakes can cause ground shaking and liquefaction, which can lead to settlement of soil and subsidence.

* Volcanic activity: The collapse of volcanic craters or the withdrawal of magma can also cause subsidence.

Consequences of Subsidence:

* Damage to infrastructure: Buildings, roads, and pipelines can crack or collapse due to uneven ground settlement.

* Flooding: Subsidence can lower the land surface, making areas more prone to flooding.

* Alteration of landscapes: Sinkholes and depressions can form, altering the natural landscape.

Other Related Terms:

* Sinkhole: A localized form of subsidence where the ground collapses into an underground cavity.

* Karst: A type of landscape characterized by the presence of sinkholes and other features caused by the dissolution of soluble rocks like limestone.

Let me know if you have any other questions.