A.weak pressure gradients and light，variable winds
B.the formation of typhoons or hurricanes in certain seasons
C.steady winds in one direction for six months followed by wind reversal for the next six months
D.steady winds generally from the southeast in the Southern Hemisphere
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A.from the still water plane to the crest
B.from the still water plane to the trough
C.from crest to trough
D.between water levels at one-quarter of the wave's length
A.navigable semicircle
B.dangerous semicircle
C.low pressure area
D.eye of the storm
A.position and area of the current
B.speed and direction toward which the current flows
C.type and characteristic of the current's flow
D.None of the above
A.directly from high pressure toward low pressure
B.directly from low pressure toward high pressure
C.from high pressure toward low pressure deflected by the earth's rotation
D.from low pressure toward high pressure deflected by the earth's rotation
A.equatorial current
B.humidity
C.rotation of the earth
D.change of seasons
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The cold ocean current which meets the warm Gulf Stream between latitudes 40°and 43°N to form the cold wall is called the（）.
The ocean bottom that extends from the shoreline out to an area where there is a marked change in slope to a greater depth is the（）.
The largest waves (heaviest chop) will usually develop where the wind blows（）.
In shallow water，waves that are too steep to be stable，causing the crests to move forward faster than the rest of the wave，are called（）.
In the Northern Hemisphere the major ocean currents tend to flow（）.
Low pressure disturbances，which travel along the intertropical convergence zone，are called（）.
The drift and set of tidal，river，and ocean currents refer to the（）.
The horse latitudes are characterized by（）.
In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n)（）.
Steam fog is most likely to occur on the Mississippi and Ohio Rivers in（）.