ripple

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ripple Small-scale ridge of sand produced by flowing water, wind motion, or wave action. The wavelength or spacing of ripple crests is usually less than 50 cm and the heights are less than 20 cm. Ripple form can be described by the wavelength to height ratio, referred to as the ripple index. The migration of ripples leads to the formation of cross-lamination in sands. See also DUNE BEDFORM.

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