Why does the material on a beach affects its gradiernt?

The material on a beach affects its gradient due to the size and shape of the sediment particles. Coarser materials, like gravel, tend to create steeper gradients because they are less easily moved by wave action, while finer sands create gentler slopes as they are more easily eroded and transported. Additionally, the composition and arrangement of particles influence how water interacts with the beach, further affecting the slope. Ultimately, the combination of these factors determines the beach's overall profile.