River Landscapes In The Uk Flashcards Preview

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Flashcards in River Landscapes In The Uk Deck (24):
1

What is a long profile

The course of a river from its source to its mouth

2

What properties do The Valley and river have at the upper course of a river

A v shaped, steep sided valley with a narrow, shallow, turbulent river

3

What properties do The Valley and river have at the middle course of a river

Floodplain ,A wider, flat floor valley with a wider, deeper river

4

What properties do The Valley and river have at the lower course of a river

Levees, a very wide and flat valley, wide, deep river with large sediment loads

5

What is hydraulic action

The force of the water hitting the river bed and banks (most effective when water is moving fast and a lot of it)

6

What is abrasion

When the load carried by the river repeatedly hits the bed or banks dislodging particles into the flow of the river

7

What is attrition

When stones carried by the river knock against each other, gradually making the stones smaller and less rounded

8

What is solution (erosion)

When the river flows over limestone or chalk the rock is slowly dissolved this is because it is soluble in mildly acidic river water

9

Where does erosion mainly take place

The upper course of the river near its source

10

What is vertical erosion

Downwards erosion

11

What is lateral erosion

Sideways erosion

12

What is erosion

The wearing away and removal of material by force or pressure

13

What is traction

Heavy rocks and boulders being rolled along the river bed. Happens in times of flood when current is strongest

14

What is saltation

Small stones and pebbles and bounced along the river bed. This happens when the river flow is less than that needed for traction to take place

15

What is suspension

Very small particles of sand or clay that are suspended in the water- it can be seen in a river as it makes the water look cloudy

16

What is solution (transportation)

It takes place when material is dissolved in the water, it’s invisible and doesn’t colour the water

17

What are the four erosion processes

Hydraulic action
Abrasion
Attrition
Solution

18

What are the four transport processes

Traction
Saltation
Suspension
Solution

19

Why do the river valleys change over time

The Valley sides are less steep as the effects of weathering and mass movement of material on The Valley sides

20

What is deposition

The river dumps or leaves the material it’s been carrying (its load)

21

Why does deposition happen

River loses energy when it slows down and therefore cannot carrying the load anymore

22

Where is large materials deposited

Large boulders are deposited in the upper course

23

Where are smaller loads deposited

Finer material is deposited further down as it can be transported further than larger loads

24

What are interlocking spurs

They are fingers of land that jut out. The river doesn’t have the energy to cut through the spurs of land, so has to flow around them. Found near source