Which feature commonly indicates past glaciations and is deposited at the edges of glaciers?

• A. Sand Dunes
• B. Coral Reefs
• C. Moraines
• D. River Terraces

Answer: (C)

When a glacier moves, it picks up and transports loose rock and soil. As the ice melts and retreats, that debris is dropped at the glacier’s edges, forming moraines. These are ridges or mounds of unsorted glacial debris that mark where the ice once stood, making them a clear sign of past glaciations. Moraines come in different forms—along the sides (lateral), at the front (terminal), or where two glaciers met (medial)—but all result from ice depositing material as it melts. Other features listed don’t come from direct glacial deposition: sand dunes are shaped by wind, coral reefs form in tropical oceans from biological activity, and river terraces arise from river erosion and sedimentation rather than ice action.