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