Fresh water from land enters
the ocean through rivers,
streams and groundwater
flowing through valleys
Main support
The types of estuaries that are not viable as
ports of call for ocean commerce are those that
are not wide enough, not deep enough and not
powerful enoungh to prevent the buildup of
sediment
One type of estuary system is the type that
is found in flooded coastal plains the broad
land areas that extend out to the continental
shelves, on the Atlantic coastal of north and
south america