A look at how the sea shapes and erodes the coastline. The British coastline is one of the most varied in the world. The coastline moves backwards as the sea wears it away. The Pembrokeshire coast has many cliffs formed from hard, rugged rock.
Children could set up an experiment in a clear plastic container to show the effects of the sea on the coastline. By putting lumps of rock and sand in the middle of the container and then pouring water from small bottles against it, they will be able to see that the rock and sand will move slightly. They will then have to explain what happened and where that moved rock and sand went. Then compare this to what is happening on our coastline.