Why do floods deteriorate rivers sides? widen over time? dirt sides for reference

The term is called erosion.Erosion occurs when water or wind deteriorates dirt,rock, basically anything as long as there is constant friction which will eventually break down such as the dirt sides of a river.

Works in a river or stream are no different ... flood are not contained by the dominant channel. after some time (possibly many years).

From our previous experiment, we examined how many drops a penny can hold - and place drops of salt water on the penny after recording 5 trials each, take the average of each solution.