Geography • Physical GeographyMedium
Which of the following describes a 'Stack' in coastal geomorphology?
A. A wave-cut platform submerged below low-tide level
B. An isolated pillar of rock standing just offshore, formed by the collapse of a sea arch✓ Correct Answer
C. A narrow ridge of sand connecting an island to the mainland
D. A horizontal notch eroded at the base of a coastal cliff
💡 Solution & Explanation
A coastal stack is formed when persistent wave action erodes the headland to create a sea arch, and the eventual collapse of its roof leaves behind an isolated pillar of rock standing in the sea. Unlike wave-cut platforms or coastal notches, stacks represent advanced sub-aerial and marine erosion features characteristic of rocky shorelines.
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