Translations:Adventist Youth Honors Answer Book/Nature/Geology/24/en
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b. Ripple marks in sand or mud (Show with an arrow the current direction if possible.)
In this photo, the wind was blowing from left to right. The left sides of the ripples have gentler slopes, while the right sides have steeper slopes. As the wind breaks over the top of the ripples, it forms eddy currents (circulating wind) which make the lee side steeper than the windward side.
