what are the three stages of a river explain
Answers
Explanation:
Rivers
Definitions of main features
Source– Where a river begins.
Tributary– Smaller rivers/streams that join the main river.
Confluence– The point where two rivers join.
Estuary– The part of the river (mouth) which is tidal.
Mouth– Where the river enters the sea/lake.
Watershed– The area of high land that separates two basins.
Course– The route taken by a river between its source
and its mouth.
River Basin– The total area drained by a river and its
Tributaries.
Main river features
Main river features
Activities of a River
EROSION
TRANSPORTATION
DEPOSITION
Four types of Erosion
Hydraulic Action- The force of the water.
Abrasion– The load hitting the bed and the banks.
Attrition– Load hitting against load and eroding.
Solution– Some rocks such as Limestone can dissolve due to acids in the water.
Transportation
Rolling- Larger rocks and boulders.
Bouncing- Smaller rocks.
Suspension- Light particles are carried in the water.
Solution- Some rocks are dissolved in water.
Ways in which a river transports its load
Ways in which a river transports its load
Deposition
(Loss of energy = has not got the energy to carry the load so it has to drop it)
– Loses speed and hasn’t the energy to carry the load.
– When the river meets resistance when trying to enter the sea or lake.
3 Stages of a River
YOUTHFUL STAGE (UPPER COURSE)
– V- Shaped Valley > Erosion
– Interlocking Spurs > Erosion
– Waterfalls > Erosion
– Potholes > Erosion
MATURE STAGE (MIDDLE COURSE)
– Meanders > Erosion and Deposition
OLD AGE STAGE (LOWER COURSE)
– Floodplains > Deposition
– Ox-Bow Lakes > Erosion and Deposition
– Deltas > Deposition
– Levees