The lower course of a river is when its energy levels are low. This is due to the fact that the river is no longer flowing downhill at a steep angle. The lack of energy causes deposition to take place.
The above photo shows the delta of the Mississippi River in the USA. A delta is formed when a river meets the sea and the river deposits material faster than the sea can remove it. Thus many smaller channels are formed as the river winds its way around the material it has depsoited as it no longer has the energy to transport or erode it.
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