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rivers - Coggle Diagram
rivers
lanscape features
upper course
youthful stage
vertical erosion is most powerful
source
beginning of a river
high up in a mountain
waterfalls
vertical drops in the river
formed by vertical erosion
interlocking spurs
criss-crossing hills
form as the river erodes the softer rock
middle course
mature stage
less steep
lateral erosion occurs
the lower course
old stage
almost flat
deposition greater
bc slow river
river moves slowly
slowly through a wide flat floodplain
meanders
bendsf
orm in the middle course
bc of greater lateral erosion
oxbow lakes
formed when meanders are cut off
estuary
part of river
affected by tides
delta
delta sometimes deposited at estuaries
mouth
enters sea
tributaries
smaller rivers
join a larger river
at a confluence
processes
erosion
hydraulic action
the power of moving water
abrasion
river's load striking bed and banks of a river
solution water slowly dissolves parts of the river channel
attrition
rock and stones carried by the river strike off each other