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There are four main parts to every ocean wave, the crest, trough, wavelength and wave height. The crest is the highest point of the wave which is above the water level. The trough is the lowest point of the wave it is a valley between crests below the average water level. The wavelength is determined by measuring the distance from crest to crest. The wave height is determined by measuring from trough to crest. Another thing you can measure on a wave is its amplitude or its maximum extent of a vibration, this can be found by measuring the distance from the equilibrium (the middle of the trough and the crest) to the crest or trough. The time it takes for two successive wave