Considering shoreline processes (wave action, longshore current, tidal current) and continental margins, what would be similar and what would be different for an submergent shoreline (U.S East Coast/Gulf Coast) vs an emergent shoreline (U.S. West Coast).

Submergent shorelines are those that have been flooded by ocean waters because of a relative rise in the elevation of sea level at that location. The rise in sea level can be either the result of an increase in the volume of water in the ocean basins or the result of the land surface sinking, both of which create an apparent rise in the elevation of sea level. A common feature of submergent coastal zones is river valleys or glacially-carved valleys that have been flooded by ocean water. Passive margins tend to be submergent due to the ongoing rise in sea level. Shoreline processes such as wave action, longshore current, and tidal current are prominent in weathering and eroding rocks in a submergent shorelines due to rise of sea level.

Emergent shorelines are a result of local tectonic uplift of the land surface or a fall in the elevation of sea level because of a reduction in the water volume of ocean basins. Quite often, emergent coasts have rocky coastlines with cliffs and nearly flat platforms that extend inland where older coastal plains have been tectonically raised and are now elevated above the modern land and water interface. Active margins can be both "emergent or submergent" depending on local tectonic forces, such as caused by faulting. In emergent coasts, wave energy, wind, and gravity erode the coastline. The erosional features are elevated relative to the wave zone.