1. Sea Cliffs: Steep, vertical rock faces that are formed when waves erode the base of a coastline. The constant pounding of waves weakens the rock, causing it to collapse and retreat.

2. Sea Caves: These are cavities formed in cliffs by the erosive power of waves. They are often found at the base of cliffs where waves can easily access cracks and weaknesses in the rock.

3. Sea Arches: Natural bridges formed when waves erode through a headland, creating an opening. These arches are often fragile and can eventually collapse, leaving behind a stack.

4. Sea Stacks: Isolated columns of rock that are left standing after waves erode away the surrounding coastline. They are formed when sea arches collapse or when waves erode a headland.

5. Wave-Cut Platforms: Flat, rocky surfaces that are exposed at low tide. They are formed when waves erode the base of a cliff, creating a platform that extends out into the sea.