A.air being warmed above the dew point
B.saturation of cold air by rain
C.a rapid cooling of the air near the surface of the Earth at night
D.warm moist air being blown over a colder surface
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A.Northwest
B.Southeast
C.Northeast
D.Southwest
A.only one high and one low water occur during a lunar day
B.the high tide is higher and the low tide is lower than usual
C.the high tide and low tide are exactly six hours apart
D.two high tides occur during a lunar day
A.hydraulic current
B.rectilinear current
C.rotary current
D.harmonic current
A.Papagayo
B.fall wind
C.foehn
D.williwaw
A.Tehuan tepecer
B.Papagayo
C.Norther
D.Pampero
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Low pressure disturbances，which travel along the intertropical convergence zone，are called（）.
The length of a wave is the length（）.
The place where a channel moves from along one bank of the river over to the other bank of the river is called a（）.
In most cases，the direction of the apparent wind lies between the bow and（）.
In the Northern Hemisphere，a wind that shifts counterclockwise is a（）.
In a tropical cyclone，in the Northern Hemisphere，a vessel hove to with the wind shifting counterclockwise is（）.
A tide is called diurnal when（）.
The direction of the surface wind is（）.
The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.
The direction of the southeast trade winds is a result of the（）.