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i) Hydraulic action
-Water is forced into cracks on the river banks/water hit banks.
-Air in the crack is compressed.
-As the water retreats, pressure in the cracks is suddenly released.
-The compression and widening of the cracks repeatedly.
-The retreating water carries away the loose particles.
-The force of the moving water and the eddying effect.
-Sweep away loose materials in the river channel.
ii) Abrasion
-River carries sand, gravel and boulders.
-The load is used as a tool for scoring the load is hurled by the water against by the river water
against the banks and drafted along river bed.
-The load chips off ricks on the bank and the floor (the size of the load determines the rate of
erosion)
-The load of being dragged smoothens the river bed.
-Eddy current rotate rock particles in hollow and widen them in potholes.
gideon1 answered the question on September 29, 2017 at 17:49
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