There are other factors that may also cause weathering, such as humidity, pollution, acid rain, and wind. There are monuments in Luxor, Egypt with writings that have remained visible for over 3500 years, but when the same ruins are sent to New York as a gift from the Egyptian government, the writing is quickly worn away and no longer legible. All in all, the surface environment, grain size, and climate all control the rate of chemical weathering. Rivers, especially fast-moving rivers, erode the land by carrying sediment away from one location and depositing it in another. This slow moving erosional force has formed the Missouri River Valley.
Tributaries are bodies of water that flow into a larger river.
Fluvial landscape' is the landscape formed by rivers. Rivers, at a certain stage in development, move back and forth in a snake-like pattern causing erosion and deposition. 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 formed when wind blows over calm waters and ripples are created.