Final answer:
Magma emplacements are not a sedimentary structure as sedimentary structures provide clues about depositional environments. Cross-beds and mud cracks are examples of sedimentary structures formed in different ways.
Explanation:
Magma emplacements is not a sedimentary structure. Sedimentary structures are features found within sedimentary rocks that provide clues about their depositional environment. Cross-beds and Mud cracks are examples of sedimentary structures where cross-beds are formed by the migration of ripples or dunes, and mud cracks are created by the shrinkage of mud as it dries out.
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