write a short note on side valley
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A valley shoulder appears at the place where the tributary flowed into the river before the glacial period. The side valley loses its height and develops into a hanging valley. In permeable rock like limestone) a side-valley becomes a gorge. In granite or other crystalline areas a waterfall may result.
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The term "side valley" is used for higher order valleysnear mountains (example above: the Pennines), as opposed to lower valleys that do not have a strong relief. This is because the "main stem river" (into which the secondary river flows) passes much more water than its tributaries and therefore
has a lower current.
has finer sediments that are deposited in a more flat manner.
The higher the order of a valley, the steeper the hillsides. Looking upstream, the steepest slopes are normally near the source of a brook (with the exception of very hard rocks in downstream direction).
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