All rivers and streams erode toward sea level, which is also known as the "ultimate base level."

A river, later to be known as the Bow, eroded the sediments and helped shape the south side of the hill.

One theory is that the river eroded the softer layers, causing the landslide.

The river has eroded into the limestone, creating cliffs and a varied topography.

The river is significantly eroding the archaeological site.

All of these cause the river suddenly to erode its bed vertically (downcutting) faster as it gains gravitational potential energy.

Usually when a river erodes the land, forming a valley, the valley takes the form of a V shape.

When the river eroded underneath, it started all of us scrambling.

At a few places the river has eroded the sides of hills, exposing coal deposits.

The river has eroded through a sandstone crust to its limestone base.