Here's a breakdown:
* Stack: A tall, isolated column of rock that has been eroded by the sea. It is often formed from a headland that has been undercut by waves, leaving the top section standing alone.
* Headland: A high point of land that juts out into the sea.
* Erosion: The process by which rocks are worn down by wind, water, or ice.
Some other terms related to coastal erosion include:
* Arch: A natural opening in a rock formation formed by erosion.
* Cave: A hollow space in a cliff face formed by erosion.
* Stump: A short, low stack that is often the result of further erosion of a stack.
* Sea cliff: A steep slope along the coast that is formed by erosion.
