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I read that the source of Karst topography is coral reefs, when coral reefs are found in water bodies, how is karst topography formed on land?

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  • $\begingroup$ Is your question how does a karst topography develop or is it a question about how the coral reefs end up on land which makes it possible for a karst topography to develop? $\endgroup$ – user824 Aug 28 '18 at 20:59
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Karst topography on land is characterized by sinkholes, springs, losing streams, and caves. They are formed by the dissolution of easily dissolved carbonate rock such as limestone and dolomite. The rock is dissolved by carbonic acid in rain.

From Wikipedia:

The carbonic acid that causes karstic features is formed as rain passes through the atmosphere picking up carbon dioxide (CO2), which dissolves in the water. Once the rain reaches the ground, it may pass through soil that can provide much more CO2 to form a weak carbonic acid solution, which dissolves calcium carbonate.

Here is an illustration of karst topography:

enter image description here

Source: //www.wandelgek.nl/?p=18828&lang=en

Here is an illustration of karst formation:

enter image description here

Source: http://slideplayer.com/slide/3400196/

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  • $\begingroup$ Also corals can reach the surface because of tectonics, even they all are formed on the sea. $\endgroup$ – user12525 Aug 28 '18 at 8:13

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