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Question
Explain the evolution of valley sinks or uvalas.
Short Note
Solution
Quite often the surface run-off simply goes down swallow and sinkholes and flows as underground streams and reemerge at a distance downstream through a cave opening. When sinkholes and dolines join together because of slumping of materials along their margins or due to roof collapse of caves, long, narrow to wide trenches called valley sinks or uvalas form.
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Chapter 7: Landforms and their Evolution - Exercises [Page 70]
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