What is the origin of the bird of paradise plant?
River Deltas: The deposition of sediment from rivers can create deltas, which are often low-lying areas near the coast. These deltas can trap seawater, forming coastal seas. The Sundarbans Delta in the Bay of Bengal is an example of a deltaic sea.
Impact Events: Large impacts by asteroids or meteorites can create depressions that become filled with water, forming impact craters that may eventually be connected to oceans, such as the Gulf of Mexico.