What best accounts for the retreating of a waterfall?
Only one answer is right
1) meandering stream action
2) erosion of the stream bed
The best account for the retreating of a waterfall is erosion of the stream bed. When a waterfall forms, it occurs because there is a sudden change in elevation along a river or stream. The force of the water falling from this elevation change can erode the riverbed downstream of the waterfall.
Over time, the continuous flow of water and the impact of the falling water cause the riverbed to erode, which eventually leads to the retreat of the waterfall. The erosion occurs mainly at the base of the waterfall, where the water hits the ground and flows downstream. As the water erodes the riverbed, it undermines the rock and soil beneath, leading to the backward movement or retreat of the waterfall.
While meandering stream action can result in the shifting or changing of the river's course, it is not directly related to the retreating of a waterfall. The primary factor responsible for the retreating of a waterfall is the erosion of the stream bed.