Final answer:
The statement in question is false; ripple marks and cross-bedding are sedimentary structures, while flood basalts are igneous and result from volcanic activity rather than sedimentary processes.
Step-by-step explanation:
The statement that ripple marks, cross-bedding, and flood basalts are all types of sedimentary structures is false. Ripple marks and cross-bedding are indeed sedimentary structures which tell a geological story.
Ripple marks are formed by the movement of water or wind over sediment, creating wavy patterns in the sandstone and indicating an environment where water was once present.
Cross-bedding occurs when sediment from the steep side of a dune or ripple is deposited on top of another layer, often providing insights into the direction of wind or water movement at the time of formation. However, flood basalts are related to volcanic activity and not sedimentary processes; they are igneous rocks that form from the rapid cooling of lava that flows over the surface. Therefore, flood basalts do not fit the category of sedimentary structures like ripple marks and cross-bedding do.