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- Dictionarysubsidence/səbˈsʌɪdns/
noun
- 1. the gradual caving in or sinking of an area of land: "the race was abandoned because of subsidence of the track"
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noun
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The motion of a surface as it shifts downward relative to a datum such as sea-level
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. Subsidence involves little or no horizontal movement, which distinguishes it from slope movement. Wikipedia