Explain river rejuvenation and identify and explain features A and B, and also explain the formation and suitability for farming of river terraces.

1.1.2 Feature A is a waterfall or knickpoint.

1.1.3 Feature A, a waterfall or knickpoint, indicates that the river has started eroding vertically again from a specific point, creating a sharp break in the river's longitudinal profile. This renewed vertical erosion is a direct result of river rejuvenation.

1.1.4 At B, the river has incised deeply into its former floodplain, creating a new, narrower valley within the older, wider valley. This shows renewed downward erosion.

1.1.5 River terraces form when a river cuts down into its own floodplain, leaving remnants of the old floodplain as flat, elevated steps on either side of the new, lower channel. This process often occurs due to changes in base level or climate, leading to cycles of deposition and erosion.

1.1.6 Some river terraces are not suitable for farming because they may have poor soil quality, be too steep, or be too narrow. They can also be prone to erosion or have limited access to water compared to active floodplains.