A surface feature formed when a stream cuts into a steep slope?

A surface feature formed when a stream cuts into a steep slope is known as a "nickpoint" or "waterfall." This occurs when the stream erodes the rock or soil at the edge of a steep gradient, creating a sudden drop in elevation. Over time, the continuous erosion can lead to the formation of a waterfall, which may retreat upstream as the stream continues to carve into the slope. This dynamic process often results in unique and striking landscapes.