Examine how the landscape is changed when a river adjusts to a change in base level, with reference to example(s) that you have studied. - Leaving Cert Geography - Question 3B - 2021

For instance, the Mississippi River provides an example of how a river can adjust to changes in base level. When the base level rises, the river may deposit more sediment, leading to delta formation at its mouth.

In addition to sediment deposition, erosion can significantly change the landscape. When a river's base level lowers, it can incise its channel, leading to increased erosion upstream. This can also lead to the formation of features such as canyons.

River rejuvenation is characterized by features such as knickpoints and waterfalls created by the sudden drop in base level. This rejuvenation process alters the river's gradient, leading to more vigorous erosion and potentially increasing sediment transport downstream.

A labelled diagram illustrating these changes emphasizes features such as terraces, deltas, and incised valleys. This visual representation complements the written account, enhancing understanding of the adjustments in the landscape.