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]] A stack is a Geological Landform consisting of a steep and often vertical column or columns of rock in the sea near a coast. Stacks are formed when part of a Headland is Eroded , leaving a small Island . They also form when a Natural Arch collapses due to Sub-aerial Processes and Gravity . A stack may collapse or be eroded leaving a Stump . Stacks form most commonly on Chalk cliffs, because of the medium resistance to Erosion . Cliffs with weaker rock, such as Clay tend to Slump and erode too quickly to form stacks, while harder rocks, such as Granite erode in different ways. EXAMPLES
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