Incised Meanders Feature Explained

Incised meanders are river bends that have been cut vertically into the landscape. They look like entrenched loops or bends in a river valley.

Understanding River Rejuvenation

Rejuvenation refers to the process where a river regains its erosive power. This typically happens when there is a relative fall in the river's base level (e.g., due to land uplift or sea-level fall).

• Increased gradient leads to increased velocity and erosive energy.
• The river starts to erode downwards more rapidly (vertical erosion).
• If the river was already meandering, rejuvenation causes these meanders to be cut down into the bedrock, forming incised meanders.

Why Rejuvenation is the Correct Answer

• Incised meanders are a classic indicator of river rejuvenation, showing vertical erosion cutting into previous lateral erosion (meandering).

Other Options Rejected

• Karst erosion: Associated with dissolution in soluble rocks (e.g., limestone), creating features like caves and sinkholes, not incised meanders.
• Aeolian erosion: Caused by wind, creating features like sand dunes and desert pavement.
• Coastal erosion: Occurs along coastlines due to wave action, forming features like cliffs and wave-cut platforms.