crest, the top of a wave , trough, the bottom of a wave , swash, the breaking wave that goes up the shore, backwash, part that flows back to the sea dragging lighter material with it , constructive , adds matherial to the shore , destructive, removes material from the shore, friction, waves are produced by the “___” caused between wind and the surface of the sea, refraction, as waves approach the shore, friction with the seabed causes them to bend and change direction, this is known as ”_____”.

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