Ripple marks are ________
A) internal laminations that are inclined at an angle relative to the main layering of a sedimentary rock.
B) a bed in which grain size varies from coarse at the bottom to fine at the top.
C) small,elongate ridges in clastic sediments and rocks that form perpendicular to the direction of flow.
D) a suite of cracks separating plates that form when mud dries out.
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