2.1 PROCESSES of RIVER EROSION
As a river winds its way from its source to
its mouth A number of processes of erosion take place :-
corrasion - this is the wearing away of the river channel
by water + load (load = material carried in the river eg boulders,
pebbles, sand etc)
attrition - as the load is carried by the river, bits collide and these are further broken up.
solution - this is where certain rocks (eg limestone) are dissolved by the river.
2.2 PROCESSES of RIVER TRANSPORT
A river moves its load by :-
(1) - rolling large stones and boulders.
(2) - carrying sand, mud and silt in suspension.
(3) - carrying minerals in solution
2.3 RIVER DEPOSITION
A river drops some of its load when either
its volume or its speed decreases eg when it enters an arid (dry)
region, crosses an area of porous rock (eg limestone), enters
a flat or gently sloping plain or enters a lake or the sea.
Material transported or deposited by a river is called alluvium.
