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Explain the classification of valleys according to the change in base-surface?

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In the valleys, from the initial stage to the development, changes also occur in the surface position. Considering the change in base – surface as the basis.

The valleys are classified into the following parts:

1. Drowned Valley 

2. Rejuvenated Valley

1. Drowned Valley: A submerged coastal valley formed as a result of rise in water level of a ocean or lake or sinking down of proximal place is called Drowned Valley. 

2. Rejuvenated Valley: On the fall in sea level, river rejuvenation involves a renewed period of vertical erosion to achieve a new and lower base level, which is called the Rejuvenated Valley

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