This slow moving erosional force has formed the Missouri River Valley. Tributaries are bodies of water which flow into a larger river. Fluvial landscape' is the landscape formed by rivers. Rivers, at a certain stage of development move back and forth in a snake-like pattern causing erosion and deposition. and forth in a This may cause the river to become so tightly curved that the river may take a short cut across the corners and create a loop or an oxbow lake. An oxbow lake is the explanation for the creation of Lake Manawa and Carter Lake.
Waves are powerful forces of erosion.
When waves hit the shore materials loosen and currents pick up and transport material known as mass wasting or mass movement. Waves are formed when wind blows over calm waters and ripples are created. These ripples enlarge with time and form larger waves. These waves then crash into continents and are considered to be a very powerful gradational force. They wear away the sides of continents.