In the folding labeling A monocline, B syncline, C anticline, which letter corresponds to a syncline?

• A. A
• B. B
• C. C
• D. None of the above

Answer: (B)

Syncline is a trough-shaped fold where the rocks dip toward the fold axis, and the youngest rocks are at the center. Anticline is an arch-shaped fold with the oldest rocks at the center, while a monocline is a single-step bend without a full arch. In the diagram, the feature that forms a trough is the one labeled as the syncline, which is the middle label.