A.in an area of high density the water's surface is lower than in an area of low density
B.surface water flows from an area of high density to one of low density
C.the lesser the density gradient the freer the water is to move
D.it is the density differences that cause the currents to stay in the troughs
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A.Moon is in its first quarter and third quarter phases
B.Sun and Moon are on opposite sides of the Earth
C.Moon's declination is maximum and opposite to that of the Sun
D.Sun and Moon are in conjunction
A.at a new or full Moon
B.when the Sun，Moon，and Earth are in line
C.at approximately 28-day intervals
D.when the Moon is at quadrature
A.at the start of spring，when the Sun is nearly over the equator
B.only when the Sun and Moon are on the same sides of the Earth and are nearly in line
C.when the Sun and Moon are at approximately 90°to each other，as seen from the Earth
D.when the Sun，Moon，and Earth are nearly in line，regardless of alignment order
A.January
B.April
C.August
D.October
A.Effect of the moon's gravity
B.Fetch
C.Wind velocity
D.Length of time a wind has been blowing
最新試題
Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes（）.
The type of current which will have the greatest effect on the course made good for your vessel is（）.
The winds with the greatest effect on the set，drift，and depth of the equatorial currents are the（）.
The velocity of the current in large coastal harbors is（）.
Which statement is TRUE concerning equatorial tides（）.
Stand of the tide is that time when（）.
The two most effective generating forces of surface ocean currents are（）.
Priming of the tides occurs（）.
The Benguela Current flows in a（）.
When daylight savings time is kept，the time of tide and current calculations must be adjusted.One way of doing this is to（）.