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why is the upper river with its fast flowing steep valley suitable for animal grazing
Because of the "steep valley sides" and the thin layer of soil (usually poor in nutrients and acidic) over a rocky subsoil.
The upper course of a river is where the the river starts. Or also known as the beginning of the river.
Which river?
Upper River Valley Hospital was created in 2007.
Upper Colorado River Authority was created in 1935.
Upper Kiamichi River Wilderness was created in 1988.
Upper Guadalupe River Authority was created in 1939.
Upper Hudson River Railroad was created in 1999.
Upper Hudson River Railroad ended in 2010.
The upper tennessee river is about 30 ft to 500 ft wide.
The source of the river. The upper reaches of the river.