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Erosion

the water wears away the land as it travels along the river's course


Estuary

the mouth of the river where it widens to meet the sea


Floodplain

the river overflows and leaves fine particles of silt on the valley floor. When the floods go away this leaves a wide flat area of good, fertile soil.


Meander

places where the river curves to form loops and bends. Sometimes the loops are cut off to leave ox bow lakes.


Pollution

things which make the river dirty such as chemicals, rubbish and sewage


Reservoir

a man-made lake which stores water for people to drink


Sediment

small pieces of rock which are carried by the water and settle on the river bed (deposition)


Source

the beginning of a river, usually a spring high in the mountains


Tributary

a river or stream which flows into a larger river


Valley

the river wears away its sides and bottom, carving out an area lower than the surrounding land