Answer: Subsidence
Explanation:
The term "subsidence" refers to the process of gradual sinking or caving in of an area of land, which can be caused by a variety of factors such as natural geological processes, human activity like mining or pumping of underground water, or even the weight of buildings and other structures. When subsidence occurs, the surface of the land can shift and crack, leading to damage to infrastructure such as roads, buildings, and pipelines, and potentially posing a threat to public safety and the environment.