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Geography Revision

Water on the Land ­ Unit 1

The River Valley
1) A path of a river as it flows downhill is called its course
2) Rivers have an upper course (closest to the source), a middle course, and a lower
course (closest to the mouth of the river)…

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Cross Profile
Erosion can be either vertical or lateral ­ both types happen at the same time but one is
usually dominant over the other at different points along the river.






The
Four Types of Erosion
Or as I like to remember it, the AHA'S:

1) Abrasion ­ Eroded rocks…

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3) There are a few reasons why rivers slow down and deposit material:
The volume of water in the river falls
The amount of eroded material in the water increases
The water is shallower, e.g. on the inside of a bend
The river reaches its mouth

River Landforms
Upper course…

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These are always formed in the middle and lower courses.
1) The current (the flow of the water) is faster on the outside of the bend because the
river channel is deeper.
2) So more erosion takes place on the outside of the bend, forming rive cliffs
3) The current…

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Levees

These are natural embankments along the edges of a river channel. During a flood,
eroded material is deposited over the whole flood plain. The heaviest material is
deposited closest to the river channel, because it gets dropped first when the river slows
down. Over time, the deposited material builds…

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Flooding
A river is likely to flood when the graph's line is steep. This is because there is a rapid
increase in discharge over a short period in time. Floods can cause extensive damage.
Flooding notoriously hits LEDC's harder than MEDC's. This is because they have worse
education of how…

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Managing the UK's water
In the UK, the places with a good supply of water aren't the same as the places with the
highest demand. These graphs show how the highest population density isn't in the places
where the most rainfall occurs in fact it's almost the complete opposite way…

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1) As technology and industry advance the demand for water grows

2) As LEDC's industrialise and urbanise their demand for water grows.

3) Most MEDC's are becoming wealthier and so people are spending more money
on technology and increasing the demand for water

One way to deal with the supply…

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