Explain three causes of river rejuvenation.

-A fall in sea level which increases the velocity of the river, thereby increasing the erosive power of the river.
-Regional uplift which creates negative sea level moment and thus makes the
river renew its erosive activity.
-Vertical erosion by the river may expose resistant rock which creates a knick point
thus renewing the rivers erosive power.
-Increase in river discharge due to increase in precipitation or due to river
capture may cause a river to renew its erosive power.
-Unequal regional subsidence of land along the river increases the gradient
and therefore erosive power of the river.