how do these stacks withstand the strong wave erosion?
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They are formed when part of a headland is eroded by hydraulic action, which is the force of the sea or water crashing against the rock. ... Erosion causes the arch to collapse, leaving the pillar of hard rock standing away from the coast—the stack. Eventually, erosion will cause the stack to collapse, leaving a stump.
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hlo✔
Stacks typically form in horizontally-bedded sedimentary or volcanic rocks, particularly on limestone cliffs. The medium hardness of these rocks means medium resistance to abrasive and attritive erosion. A more resistant layer may form a capstone...
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