Explain with reasons how stacks are formed from sea arches?
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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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The force of the water weakens cracks in the headland, causing them to later collapse, forming free-standing stacks and even a small island. ... Erosion causes the arch to collapse, leaving the pillar of hard rock standing away from the coast—the stack.
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