Benagil Karst in the South of Portugal
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Benagil Karst in the South of Portugal

by Nuno Correia, Porto, Portugal

In the case of the Benagil Sea Cave, the limestone cliffs along the coast experienced differential erosion, where softer and weaker rock layers were eroded at a faster rate compared to the more resistant layers. This differential erosion created openings and cavities in the cliffs, eventually forming the cave.