Swash is powered by the ____ wind, but backwash is powered by ____. Swash ____ and backwash ____ the beaches. The frequency and wave height for destructive waves are ____ but in constructive waves these are ____. Large, destructive waves will be created if the wind has a long fetch, blows for a ____ time and is ____ powerful. Wind data can be displayed on a wind ____ diagram.

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