The direction of the surface wind is（）.

Steam fog is most likely to occur on the Mississippi and Ohio Rivers in（）.

In a tropical cyclone，in the Northern Hemisphere，a vessel hove to with the wind shifting counterclockwise is（）.

The apparent wind can be zero when the true wind is from（）.

Ocean currents are well defined and（）.

The length of a wave is the length（）.

The horse latitudes are characterized by（）.

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

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)（）.

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（）.