Steady winds produce a pattern on the sea’s surface like parallel furrows in a field

Researchers are still trying to unravel the complex interactions between wind, waves and currents. One of the most visible results of these interactions is Langmuir circulation, which produces a pattern on the water surface like parallel furrows in a field. These lines are known as wind streaks or windrows, and occur only in steady winds of more than 7mph.

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Source: Guardian Environment