How does a fan shape pile of sand form?

A fan-shaped pile of sand forms due to the process of sediment deposition, typically influenced by wind or water flow. As the wind or water slows down, it loses the energy needed to carry the sand particles, causing them to settle in a radiating pattern from a central point. This results in a broad, sloping shape, similar to a fan. The angle of repose and the consistency of the sand also play crucial roles in determining the final shape of the pile.