How does an interlocking spurs form?

Interlocking spurs form in a river valley as a result of the meandering nature of the river's flow. When a river cuts through a landscape, it erodes the softer rock and soil, creating bends and curves. The harder rock formations on either side of the river remain, leading to the development of interlocking spurs that protrude into the valley. This pattern creates a series of alternating ridges that interlock with one another, resembling the teeth of a zipper.