A graphical representation of this is called a tidal curve . The changing alignment of the earth, moon, and sun creates tidal currents . An incoming tidal current is called a flood current while an outgoing current is called an ebb current . In time, tidal action produces mudflats which are very common on the Georgia coast. Eventually, salt-tolerant plants occupy these mudflats to create a salt marsh .
Salt marshes are valuable for wildlife .
Unfortunately, they're used extensively for agriculture and development . These areas are prone to subsidence once large cities are built on them, however.