What are some examples of primary and secondary coasts?

Primary coasts are formed by natural processes, such as erosion and sediment deposition, and include features like rocky shorelines, deltas, and barrier islands. Examples include the rugged coast of Maine and the Nile Delta. Secondary coasts, on the other hand, are shaped by human activities, such as construction and modification, and include features like urban shorelines and artificial harbors. Examples of secondary coasts can be seen in places like San Francisco Bay and the coastline of Miami.