This is a 15 mark geography question, please help, thanks.
A river is said to be rejuvenated when the base level that it is flowing down to is lowered. This can happen by uplift of land, or by a sea or lake that it is flowing into becoming lower.
Here is an exmple, The final stages of the stream valley development occur when the stream has eroded down to base level over its entire course. In this state the stream is no longer downcutting but is instead laterally eroding the loose unconsolidated sediment of its own floodplain. The entire region will then be eroded to a flat plane. If this area is affected by uplift the stream system will react by sharply downcutting again. This produces very steep valley walls and flat divides that are characteristic of the early stage of stream valley development.
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