Building dams to create reservoirs and to generate electricity is one of the many ways humans use rivers for their own benefit.Image from www.metacoustics.com
The Nile delta is considered to be an arcuate delta( ie.it is arc shaped).The topsoil in the delta is up to 70 feet deep. It is approximately 160 km in length from north to south. It is one of the world's largest river deltas,stretching from Alexandria in the west to Port Said in the east and covering 240 km of the Mediterranean coastline. This region supports much agriculture due to its fertile soil. Image from www.traveltoegypt.com
The Colorado River in Arizona,USA takes a 180 degree turn at the Horseshoe Bend which the river has formed by eroding the Navaho sandstone over millions of years. Image from www.oceanlight.com
This is a diagram of the erosion processes taking place in a waterfall. Examples of waterfalls in Ireland are Powerscourt Waterfall,Co. Wicklow,Glencar Waterfall, Co.Leitrim and Torc Waterfall,Co.Kerry.