1. Sea cliffs: These are steep, vertical cliffs that are formed when waves erode the coastline at the base of the slope. As the waves undercut the cliff, it eventually collapses and falls away, creating a new cliff face.
2. Wave-cut platforms: These are gently sloping platforms that are formed when waves erode the bedrock at the base of a cliff. As the waves continue to erode the bedrock, the platform grows, and the cliff becomes higher.
3. Sea stacks: These are isolated columns of rock that are formed when sea cliffs are eroded and partially collapse. The stacks are usually capped with a more resistant layer of rock, which protects them from further erosion.
4. Sea arches: These are natural arches that are formed when sea cliffs are eroded by waves on two sides. The arches can be a variety of shapes and sizes, depending on the nature of the coastline and the erosional processes involved.
5. Blowholes: These are holes in the rocks along the shore that allow water to blow up during high tide or a storm. The water pressure builds up in the holes and then shoots up violently, sometimes reaching a height of several meters. Blowholes are usually found in areas where the rocks are relatively soft and easily eroded.
These are just a few of the many erosional features that can be found along shorelines around the world. The specific features that are present in a particular area will depend on the local geology, climate, and wave conditions.