單項選擇題

A（）is created by a pressure gradient or slope in the water level.

A.gradient current
B.density current
C.swift current
D.torrent current

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單項選擇題

（）is the most widespread type likely to be encountered at sea and is caused by relatively warm air being cooled by flowing over a cooler sea surface.

A.FRONTAL FOG
B.MIXING FOG
C.ADVECTION FOG
D.RADIATION FOG

單項選擇題

（）is a type of fog occurring close to the sea surface when the air is dry and cold-probably at least 9℃ below the sea surface temperature.

A.MIXING FOG
B.ADVECTION FOG
C.RADIATION FOG
D.ARCTIC SEA SMOKE