🔍 Key Concepts

• River training structures and why they are built • Difference between natural features (like islands or bars) and man‑made works • How submerged structures affect current and channel alignment

💭 Think About

• Look at each choice and ask: Is this usually a natural feature or something constructed by engineers? • Which term is typically used for structures built out from the riverbank to control erosion and direct the flow? • Think about what kind of structure would work even when you can’t see it above the water, because it is submerged.

✅ Before You Answer

• Identify which options are natural formations versus engineered structures • Confirm which term is specifically used for a structure that extends from the bank into the river • Make sure the term you pick is associated with controlling or training the channel, not just changing the river’s course.