Explain the Steps on how the Waterfall is Created

1] Soft Rock is eroded Faster than the Hard Rock. 2] As this Erosion of the Soft rock Continues, the Hard Rock is Undercut, and Hangs over. 3] Abrasion and Hydraulic Action creates a Plunge Pool 4] The Plunge Pool gets bigger with time, which then Increases the Size of the Hard Rock Overhanging, until its own Weight can't be supported which results into an Collapsing 5] This keeps Happening again and again; the Waterfall Retreats Upstream 6] Where the Waterfall once was leaves Steep-Sided valley. This is a Gorge