A.Prevailing Westerly
B.Sub-Polar Flow
C.West Wind Drift
D.Humboldt Current
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A.the density of the water
B.the air temperature
C.the presence of a high pressure area near it
D.underwater soil conditions
A.density differences of the water
B.rotation of the earth
C.direction of primary circulation of air
D.all of the above
A.north
B.east
C.southwest
D.northwest
A.speed of the current at a particular time
B.maximum speed of the current
C.direction from which the current flows
D.direction in which the current flows
A.east
B.northeast
C.southwest
D.west
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The two most effective generating forces of surface ocean currents are（）.
The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.
Neap tides occur only（）.
You are docking a vessel．Wind and current are most favorable when they are（）.
The tide is（）.
The tide（）.It’s 2 hours before low water，and（）your present position you will be aground at low water.
The set of the current is the（）.
Stand of the tide is that time when（）.
Tides are superimposed on nontidal rising and falling water levels，caused by（）．
Which statement is TRUE concerning equatorial tides（）.