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10 Cards in this Set

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current that flows in the direction opposite the main current

countercurrent

strong current formed as a wave retreats through a gap in a sandbar

rip current

upward-flowing current

upswelling

gentle current from receding waves

underflow

wave with white foamy top due to strong winds

whitecap

the length of time between one crest and the next

period

wave with a white crest due to shallow water

breaker

gentle, rolling wave that may appear even during calm weather

ocean swell

the depression in the water between crests

trough

giant wave, usually caused by an undersea earthquake

tsunami