Distinctive Landscape Flashcards Preview

Geography Year 10 > Distinctive Landscape > Flashcards

Flashcards in Distinctive Landscape Deck (16):
1

Erosion

A geomorphic process involving the breakdown of material through water (ocean or rivers)

2

Weathering

A geomorphic process which involves the breakdown of materials through atmospheric and biological actions

3

Mechanical weathering

Freeze thaw action:
cracks in rocks fill with water that freezes at night,
ice expands by 9% causing pressure on rock. cracks get bigger and the cycle continues

4

Chemical weathering

water reacts with certain minerals. minerals are weakened when exposed to air (oxidation). rocks like chalk and limestone, are affected by solutions

5

Biological weather

Rocks and land on coast broken down by living organisms, plants and animals.They make cracks which water can then penetrate.

6

4 types of erosion

Hydraulic action
Abrasion
Attrition
Corrosion

7

Hydraulic action

water enters cracks in bank and compresses air, when water levels reduce the air expands causing a mini explosion.

8

Abrasion

Bank or channel is worn down by materials carried by the river flow like rocks and stones

9

Attrition

Rocks and stones bump into each other, smoothed down and into smaller pieces

10

Corrosion

Chemical breakdown of rock
acids from rain dissolve rocks on bank surface.

11

4 transportation of sediment

Traction
Suspension
Saltation
Solution

12

Traction

Large boulders and rocks carried along river bed by water flow, scraping floor as they do so.

13

Suspention

Small pebbles and stones bounce along bed in small jumps

14

saltation

Very fine material carried by water flow. Water appears murky

15

Solution

Some types of sediment like minerals are dissolved in water and carried along in solution

16

3 Hypotheses

1: bed load will become smaller and less angular from the upper course to the lower course
2: Width and depth will increase along the long profile
3:The velocity of the river will increase from the upper course to lower course