The power distribution of these phenomena is plotted on the Pierson–Moskowitz spectrum. Averaging the largest third of a sample of these phenomena is used to calculate a “significant” measure of their size denoted H-sub-s. The tangent of alpha over the square root of the relative size of these phenomena equals the Iribarren number. Groins dissipate high-energy types of these phenomena, which are caused by (10[1])a longer fetch. Collisions between these phenomena form their large and destructive “rogue” type. These phenomena recede (10[1])perpendicularly before returning at an oblique angle (10[1])when transporting sediment through longshore drift. (-5[1])For 10 points, shoaling (10[1])involves a change in what phenomena’s height, which is (10[2])measured from crest to trough? ■END■ (10[2])