The force of the river against the banks can
cause air to be trapped in cracks and
crevices. The pressure weakens the banks
and gradually wears it away.
Abrasion
Rocks carried along by
the river wear down the
river bed and banks.
Attrition
Rocks being carried by the
river smash together and
break into smaller, smoother
and rounder particles.
Solution
Soluble particles are
dissolved into the river.
Transport
Solution
Minerals are dissolved
in the water and
carried along in
solution.
Suspension
Fine light material is
carried along in the water.
Saltation
Small pebbles and
stones are bounced
along the river bed.
Traction
Large boulders and
rocks are rolled along
the river bed.
Deposition
When a river loses
energy, it will drop or
deposit some of the
material it is carrying.
Deposition may
take place when a
river enters an area
of shallow water or
when the volume of
water decreases.
After a flood
During time
of drought
Deposition is common towards the
end of a river's journey, at the
mouth.
Deposition at the mouth of
a river can form deltas