The horse latitudes are characterized by（）.

A swift current occurring in a narrow passage connecting two large bodies of water which is produced by the continuously changing difference in height of tide at the two ends of the passage is called a(n)（）.

The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.

In the Northern Hemisphere the major ocean currents tend to flow（）.

The length of a wave is the length（）.

Low pressure disturbances，which travel along the intertropical convergence zone，are called（）.

The height of a wave is the vertical distance（）.

The largest waves (heaviest chop) will usually develop where the wind blows（）.

In the Northern Hemisphere you are caught in the dangerous semicircle with plenty of sea room available. The best course of action is to bring the wind on the（）.

Advection fog is most commonly caused by（）.