English Subsidence Cited by user Kent G. Budge on 11 Dec 2021 Subsidence is a general term for downward vertical movement of the Earth's surface, which can be caused by both natural processes and human activities.
English Sinkhole Cited by user RockDoc485 on 30 May 2019 The formation of sinkholes involves natural processes of erosion or gradual removal of slightly soluble bedrock (such as limestone) by percolating water, the collapse of…