Stack (geology)

From Academic Kids

Stack, near
Stack, near Old Harry Rocks
Old Harry Rocks
Old Harry Rocks

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.

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