A.interruption of the normal current flow by the footing
B.elevating in mud-slide zones
C.penetrating rapidly through a hard crust into weaker soils
D.extracting legs from soils with high cohesion
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A.pick up speed where the channel widens
B.run slower in the center of the channel
C.hug the inside of a bend
D.cause the greatest depth of water to be along the outside of a bend
A.at times of new and full Moon
B.when the Earth，Moon，and Sun are lying approximately on the same line
C.when the Moon is between first quarter and full and between third quarter and new
D.when the Moon is between new and first quarter and between full and third quarter
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
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
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The steady current circling the globe at about 60°S is the（）.
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（）.
You are docking a vessel．Wind and current are most favorable when they are（）.
The Benguela Current flows in a（）.
（）is not a type of tide.
A wave entering（）is likely to produce bores．
The velocity of a rotary tidal current will be decreased when the Moon is（）.
You are anchoring in a river where the current is from one direction only.The best way to lay out two anchors is to have them（）.
The two most effective generating forces of surface ocean currents are（）.