Long profile
The long profile of a river= changes in altitude of the course of the river from its source, along the entire length of its channel, to the river mouth.
Long profile= smoothly concave
= gradient being steeper in the upper course+ becoming progressively gentler towards the mouth.
Irregularities - gradient fequenetly occur = represented by rapids, waterfalls or lakes.
Rejuvenation= marked breaks + changes in slope= knick points
Rejuvenation = sea level (in relation to the land) falls or when the land surface rises= allow the river to revive its erosion activity in a vertical direction= the river adjusts to the new base level- in its lowest reaches+ then progressively inland.
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