Question.
Explain the evolution of valley sinks or uvulas.
Answer.
Valley sinks or uvulas are the same things. Valley sinks are erosional landforms of Karst topography.
Evolution of valley sinks:
The following way valley sinks are evolved:
- In dolomite, limestone, or karst zones, the rocks are permeable and are made up of highly fused and broken rocks. In karst areas, small to medium-sized shallow pits are formed due to seepage of surface water, and these shallow pits are called sinkholes. Surface water from these sinkholes drains into the underground.
- The bottom of these sinkholes forms underground caves and sinkholes sometimes collapse and are commonly called collapse sinks or dolines.
- Typically, surface runoff runs down through sinkholes and flows underground, and at some distance through cave openings again to the surface.
- valley sinks or uvulas are developed when sinkholes and doline join together due to the collapse of cave ceilings.
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