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Speed ​​of the current
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The speed of the current has a great influence on the formation of ripple-marks. If it is too low, the sand does not move. As it increases, the upper grains begin to move horizontally in a back and forth movement without forming any wrinkles. From a certain threshold, wrinkles appear and their size increases rapidly. If the current still strengthens, the surface of the sand flattens out and the wrinkles disappear.
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