Diagram showing stages of Waterfall Formation

Stage 1: 

• As the river passes over the soft rock, it is able to erode at a faster rate than harder rock, so a step in the river bed develops.
• As years go by, a ledge of hard rock develops.

Stage 2:

• The water rushes over the ledge and erodes the soft rock through the force of hydraulic action and abrasion. This deepens the…