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GEOGRAPHY - Coggle Diagram
GEOGRAPHY
River
River terms
Source: the point where a river begins
Course: the route taken by a river as it flow into the sea
Tributary: a small river or stream that joins up with the river
Confluence: the point at which a tributary joins the river
Mouth: the point where a river enters the sea
Estuary: the part of a river mouth that is tidal
River basin: the area of land drained by a river and its tributaries
Watershed: the high ground that separates one river basin and another
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The work of rivers
River erosion
● Hydraulic action is the force of the moving water which breaks off material from the banks and bed of the rivers
● Abrasion is the materials carried along by the river that hits off its banks and wearing them away
● Attrition is the material being worn down, smoothed and rounded as the particles bounce off each other
● Solution occurs when acids in the water dissolve some rocks such as limestone
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Transportion
● Roll -The larger particles such as pebbles and stones are rolled along the bed of the river
● Bounce- The smaller particles such as sand are bounced along the bed of the river
● Suspend -The lightest particles such as silt and clay are carried along the bed of the river
● Solution- The dissolved load such as limestone is carried in solution
Deposition
The river drops its load when:
● The river loses speed and has less energy
● The river’s volume decreases
● The river enters a flat or gently sloping plain
● The river flows into a lake or sea
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