FRESH WATER FROM LAND ENTERS THE OCEAN THROUGH RIVERS
ESTREAMS AND GROUNDWATER FLOWING THROUGH VALLEYS,
THESE VALLEYS, THAT CHANNEL FRESH WATER FROM LAND TO THE
SALTY OCEAN, WHICH RANGE FROM EXTREMELLY NARROW
STREAM CUT CHANNELS TO REMARKABLY BROAD LAGOONS
BEHIND LONG BARRIER ISLANDS, ARE CALLED ESTUARIES.
THE POWERFUL FLOW OF WATER IN MAJOR RIVERS MAINTAINS CHANNELS THAT
ARE DEEP ENOUGHT FOR NAVIGATION BY OCEAN BOUND VESSELS AND THE RIVERS
THEMSELVES PROVIDE TRANSPORTATION OF GOODS TO POINTS FARTHER INLAND
ESTUARY SYSTEMS WHICH VARY TO REFLECT THE GEOLOGY OF
THE COASTS WHERE THEY ARE FOUND CAN BE BROADLY
CATEGORIZED AS ONE OF TWO DIFFERENT TYPE
MAINT SUPPORT
THE TYPES OF ESTUARIES THAT ARE NO VIABLE AS PORTS
OF CALL FOR OCEAN COMMERCE ARE THOSE THAT ARE
NOT WIDE ENOUGH , NO DEEP ENOUGH AND NOT
POWERFUL ENOUGH TO PREVENT THE BUILDUP OF
SEDIMENT.
ONE TYPE OF ESTUARY SYSTEM IS TYPE THAT IS FOUND IN
FLOODED COASTAL PLAINS, THE BROAD LAND AREAS THAT
EXTEND OUT TO THE CONTINENTAL SHELVES, ON THE ATLANTIC
COASTS OF NORTH AND SOUT AMERICA.