Illustration of ocean base with volcanic island and coral reef
Illustration of reef base with volcanic island and barrier reef
Illustration of reef base with volcanic island and fringing reef
As per Darwin's theory about the formation of coral atolls, this illustration shows the remaining coral atoll following subsidence of the original volcanic island.
Illustration of a 3D coastline showing mountains to open ocean
Illustration of a 3D coastline with mountains to open ocean and upwelling