Rivers erode the sides of their channels more than the bottom, forming meanders due to erosion and deposition by moving water.
Erosion by Slow-Flowing Rivers: Rivers flowing over gentle slopes erode the sides of their channels more than the bottom. Large curves, called meanders, form because of erosion and deposition by the moving water. The curves are called meanders because they slowly "wander" over the land.
https://brainly.com/question/2501241