* Sea level changes. Amelia Island was once part of the mainland, but sea levels rose and fell over time, eventually flooding the land and creating the island. These sea level changes exposed ancient river deltas and other geological formations that contain fossilized shark teeth.
* Erosion. The coastline of Amelia Island is constantly eroding, and this erosion exposes new layers of sediment that contain fossilized shark teeth.
* Tourist collection. Amelia Island is a popular tourist destination, and many people enjoy searching for fossilized shark teeth on the beach. This activity helps to distribute the teeth and make them more visible to other people.
The combination of these factors has made Amelia Island a hotspot for fossilized shark teeth. These teeth are a valuable reminder of the island's natural history and are a popular attraction for tourists and locals alike.