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
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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.shallow water
B.deep water
C.river
D.tide
A.SEMIDIURNAL
B.DIURNAL
C.MIXED
D.OSCILLATING
A.slack water when upbound
B.shallow water
C.a cross current
D.a head current
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Neap tides occur（）.
When there are small differences between the heights of two successive high tides or two successive low tides，the tides are called（）.
The tide is（）.
River currents tend to（）.
The two most effective generating forces of surface ocean currents are（）.
You are docking a vessel．Wind and current are most favorable when they are（）.
Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes（）.
Priming of the tides occurs（）.
When daylight savings time is kept，the time of tide and current calculations must be adjusted.One way of doing this is to（）.
Which current would you encounter on a direct passage from London，England，to Capetown，South Africa（）.