Question 1991Navigation General

The correct answer is A) semidiurnal. The class of tide that prevails in the greatest number of important harbors on the Atlantic Coast is semidiurnal. Semidiurnal tides are characterized by two high tides and two low tides of approximately equal height each day. This is the predominant tidal pattern along the Atlantic Coast of the United States, including many major harbors and ports. The other options are incorrect because: B) diurnal tides have only one high and one low tide per day, C) interval tides do not refer to a specific tidal pattern, and D) mixed tides have a combination of semidiurnal and diurnal characteristics, but are not the most common type on the Atlantic Coast.