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GS Geography Physical Geography of World
Q.

Sink hole is a phenomenon of topography.
Explanation:

ANS. (D) 
The underground water of Karst topography carves our impressive channels and caves that are susceptible to collapse from the surface. When enough limestone is eroded from underground, a sinkhole (also called a do line) may develop. Sinkholes are depressions that form when a portion of the lithosphere below is eroded away.

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